[IGSREPORT-10690] Wk 1239 EMR Analysis Report

Brian Donahue bdonahue at geod.nrcan.gc.ca
Thu Oct 16 06:35:03 PDT 2003


******************************************************************************
IGS Electronic Report   16 Oct 06:35:05 PDT 2003      Message Number 10690
******************************************************************************

Author: NRCan/GSDivision

********************************************************************************
EMR ANALYSIS REPORT GPS-WEEK 1239    Dates: 03oct05  to  03oct11                
********************************************************************************

NRCan (Natural Resources Canada, formerly Energy, Mines and Resources (EMR))
615 Booth Street, Ottawa, Canada K1A 0E9
e-mail: pierre at geod.nrcan.gc.ca, huot at geod.nrcan.gc.ca
tel:    (613)992-2218 (Pierre Tetreault)
	(613)996-4914 (Caroline Huot)
fax:    (613)995-3215

PRODUCTS GENERATED:
The following products are generated and uploaded into CDDIS @ NASA/GSFC
   EMR12390-6.SP3     GPS ephem. files for days 0-6, week #1239 in sp3 format 
   EMR12397.ERP       pole x,y and DUT1 solutions for week #1239
   EMR12397.SNX       station and EOP weekly combined solution in SINEX format
   EMR12397.SUM       name of this text summary file

REMARKS on EMR products:
1. ALGO receiver clock used as reference time. In the sp3 EPH file sat. clock
   correction value of 999999.999999 microseconds indicates that the direct clock 
   comparison with the reference clock is not available (e.g. ALGO not observing
   a satellite). 
   ALGO clock error & drift were about 313.2 ns (52917) & 7.3 ns/day w.r.t.
   GPS time
 
SOLUTION CHARACTERISTICS
1. Solution identifier:  Submission 031015
2. Software used      :  GIPSY/OASIS II (UNIX )
3. Definition of Terrestrial frame:
   origin and orientation         :  Nominally IGS00
   reference epoch                :  current date
   GM                             :  398600.4415 km^3/s^2
   gravity model                  :  GEMT3( 8,8) +C21+S21
   ocean loading                  :  Pagiatakis, global_model
4. Solution characteristics:
      undifferenced phase and smoothed pseudorange data for satellite
      elevation > 15 degrees at 5 min. normal point interval; single 
      day (24h) arc with 6 IC and 3 rad. parameters per satellite
5. See IGS Mail#3708 (January 23, 2002), IGS Mail#928 (April 05, 1995) 
   and IGS Report#1488 (January 16, 1995) for more details regarding NRCan
   processing strategy.


CARRIER PHASE / PSEUDO RANGE STATISTICS

Note: F indicates a constrained fiducial site
      E indicates an eclipsing satellite

                             Carrier Phase Statistics
                                 rms (cm) /  # obs  

            03oct05   03oct06   03oct07   03oct08   03oct09   03oct10   03oct11 
          ---------------------------------------------------------------------
ALGO       .38/2426  .39/2422  .40/2417  .39/2415  .40/2414  .39/2419  .39/2415 
AREQ       .00/   0  .39/1808  .41/1971  .39/1998  .42/1653  .39/1728  .37/1825 
ASC1       .00/   0  .50/1880  .55/2111  .00/   0  .00/   0  .48/1825  .00/   0 
AUCK       .00/   0  .45/1720  .39/1928  .45/2009  .42/1677  .41/2029  .53/1970 
BAHR       .00/   0  .46/2055  .50/2173  .58/2054  .52/1889  .53/2060  .46/2415 
BRAZ       .00/   0  .57/1870  .57/1713  .00/   0  .00/   0  .00/   0  .00/   0 
CAS1       .00/   0  .41/2178  .40/2252  .43/2417  .42/2493  .39/2452  .40/2443 
CEDU       .40/2221  .41/2400  .40/1934  .42/2197  .38/2035  .40/2465  .39/1910 
COCO       .00/   0  .00/   0  .42/2497  .41/2181  .42/2404  .46/2129  .44/2207 
CORD       .46/1408  .53/1908  .00/   0  .00/   0  .00/   0  .00/   0  .00/   0 
CRO1       .00/   0  .00/   0  .00/   0  .00/   0  .00/   0  .00/   0  .55/1725 
DAV1       .00/   0  .38/2229  .37/2416  .37/2406  .36/2490  .38/2416  .37/2418 
DRAO       .40/2494  .47/2059  .55/2144  .54/2164  .50/1944  .42/2252  .43/2398 
EISL       .00/   0  .52/1787  .00/   0  .52/1795  .45/1594  .42/1651  .37/1352 
FAIR       .49/2454  .55/2273  .55/2304  .49/2155  .50/2282  .50/2388  .51/2486 
FORT       .61/1538  .00/   0  .00/   0  .00/   0  .00/   0  .00/   0  .58/1576 
GOUG       .00/   0  .00/   0  .61/1282  .00/   0  .00/   0  .00/   0  .00/   0 
GRAZ       .55/1849  .39/ 640  .44/ 890  .48/2172  .46/1782  .46/1977  .47/2107 
GUAM       .00/   0  .00/   0  .00/   0  .77/1858  .00/   0  .00/   0  .00/   0 
GUAT       .00/   0  .00/   0  .00/   0  .55/2156  .63/1833  .52/1417  .00/   0 
HOB2       .00/   0  .51/2078  .00/   0  .00/   0  .00/   0  .00/   0  .00/   0 
HRAO       .41/2105  .42/1984  .43/1609  .47/1837  .00/   0  .00/   0  .00/   0 
IRKT       .42/1883  .00/   0  .50/2261  .46/2159  .43/1836  .42/1544  .45/1958 
KELY       .63/1991  .57/1326  .65/1982  .64/2333  .63/2029  .64/2179  .62/2217 
KERG       .46/1822  .59/1802  .64/1845  .54/1884  .51/1753  .56/1473  .60/2104 
KIT3       .00/   0  .00/   0  .00/   0  .00/   0  .52/1797  .57/1487  .55/1937 
KOUR       .00/   0  .55/1452  .65/2189  .00/   0  .00/   0  .00/   0  .00/   0 
LHAS       .00/   0  .00/   0  .49/2147  .44/1895  .46/1724  .00/   0  .00/   0 
LPGS       .00/   0  .00/   0  .50/1726  .51/1222  .46/1361  .42/1442  .43/1521 
MAC1       .00/   0  .36/1878  .39/1980  .48/1959  .40/1923  .37/2226  .34/1998 
MAG0       .00/   0  .00/   0  .00/   0  .00/   0  .42/2015  .44/2129  .42/2146 
MANA       .61/1792  .62/2157  .00/   0  .00/   0  .00/   0  .00/   0  .00/   0 
MAS1       .00/   0  .51/1933  .47/2357  .44/2173  .42/2086  .48/2200  .49/2084 
MCM4       .32/1947  .31/2026  .31/1967  .30/1798  .33/2025  .32/1775  .32/2096 
MKEA       .54/2113  .69/1795  .66/1836  .63/2291  .65/1878  .66/2198  .66/1969 
NRC1       .40/2241  .39/2353  .43/2364  .40/2361  .38/2209  .38/2427  .43/2427 
NRIL       .41/2736  .46/2364  .50/2607  .44/2450  .46/2096  .40/2572  .52/2046 
NYAL       .40/2709  .44/2555  .51/2638  .43/2464  .43/2655  .42/2635  .42/2680 
OHI2       .39/2548  .46/2580  .47/2636  .43/2553  .43/2316  .46/2458  .47/2241 
PERT       .00/   0  .45/2210  .45/2311  .48/2291  .44/2314  .46/2318  .52/2402 
PIE1       .00/   0  .50/1892  .44/1971  .43/2047  .45/2053  .51/2058  .49/1677 
PIMO       .00/   0  .00/   0  .00/   0  .00/   0  .00/   0  .72/1722  .64/1936 
POL2       .37/2086  .43/2309  .42/2080  .40/1195  .00/   0  .00/   0  .00/   0 
SSIA       .00/   0  .00/   0  .00/   0  .00/   0  .00/   0  .00/   0  .60/ 115 
STJO       .51/2178  .52/2146  .45/2335  .43/2414  .45/2227  .40/2473  .47/2473 
THTI       .00/   0  .65/2061  .00/   0  .00/   0  .66/1966  .00/   0  .00/   0 
TSKB       .42/2223  .51/2349  .50/2151  .45/2261  .45/2083  .00/   0  .00/   0 
USNO       .00/   0  .49/1114  .00/   0  .52/2009  .51/2107  .54/2184  .58/1942 
USUD       .44/2039  .50/2148  .49/2148  .45/2152  .42/2030  .45/2125  .50/1855 
VILL       .00/   0  .52/1926  .47/2177  .46/2276  .44/2166  .46/2280  .55/1988 
YELL       .41/2537  .40/2234  .44/2252  .46/2250  .42/2185  .42/2453  .41/2424 
ZAMB       .00/   0  .00/   0  .00/   0  .00/   0  .43/1321  .43/1462  .41/2082 

PRN01      .45/1851  .49/2918  .47/3007  .47/2924  .49/2944  .49/2807  .47/2710 
PRN02      .48/1896  .47/2727  .50/2929  .49/2941  .50/2986  .48/3015  .51/2757 
PRN03      .46/1803  .49/2887  .47/2979  .48/2957  .48/3080  .52/2951  .53/3048 
PRN04      .46/1796  .50/3142  .48/2999  .49/3070  .48/2978  .48/3042  .47/3019 
PRN05      .35/ 958  .39/1271  .40/1880  .41/1532  .43/1950  .40/1958  .43/1906 
PRN06      .47/1744  .51/2989  .48/3078  .50/2960  .50/2970  .47/3219  .51/2963 
PRN07      .45/1937  .45/2786  .48/2922  .47/2953  .46/2920  .44/2901  .46/2637 
PRN08      .46/2080  .48/3214  .46/2726  .46/3061  .46/3121  .46/2958  .46/3214 
PRN09      .48/2104  .48/3004  .49/3224  .51/3222  .48/3352  .49/3250  .49/3087 
PRN10 E    .44/1759  .45/2929  .46/2417  .43/2750  .43/2691  .41/2610  .45/2682 
PRN11      .50/1922  .50/2581  .49/2980  .51/2765  .49/2932  .46/2659  .49/2621 
PRN13      .42/1232  .46/2123  .46/2210  .45/2308  .44/1841  .43/2045  .44/2215 
PRN14      .43/1555  .47/1993  .46/2784  .45/2535  .44/2430  .46/2297  .50/2470 
PRN15      .47/1690  .48/2878  .46/3090  .46/2960  .46/3176  .49/2928  .47/2972 
PRN16 E    .46/1736  .48/2411  .50/2736  .45/2541  .43/2060  .48/1970  .49/2756 
PRN17      .46/1819  .48/2991  .46/2787  .49/2961  .44/2659  .47/3165  .49/3047 
PRN18 E    .43/1740  .43/2699  .45/2470  .46/2768  .43/2719  .41/2258  .49/2617 
PRN20 E    .47/1734  .43/2398  .47/2827  .46/2898  .46/2706  .45/2882  .50/2965 
PRN21      .41/1676  .46/2685  .46/2574  .46/2788  .42/2389  .43/2430  .46/2766 
PRN23 E    .57/1573  .66/1877  .68/2061  .62/1565  .54/1437  .52/2491  .53/2160 
PRN24      .43/1716  .49/3039  .47/2926  .50/3068  .46/2882  .45/2947  .49/2985 
PRN25      .44/1836  .46/2879  .43/2703  .47/2992  .44/2943  .46/2773  .47/2830 
PRN26      .43/2061  .48/3103  .48/2864  .49/3020  .45/3047  .48/2899  .45/2892 
PRN27      .47/1917  .45/2936  .44/2691  .47/2887  .45/3028  .43/2689  .44/3145 
PRN28 E    .43/1496  .49/2727  .46/2735  .46/2770  .45/2579  .43/2745  .48/2950 
PRN29      .43/2060  .62/3117  .69/2797  .49/2985  .45/2875  .47/2955  .44/1878 
PRN30 E    .44/1601  .42/2597  .47/3108  .48/2899  .48/2825  .50/3154  .49/3172 
PRN31      .48/2048  .50/3000  .48/3097  .48/3171  .48/3125  .47/3030  .48/3101 


                             Pseudo Range Statistics
                                rms (cm) /  # obs

            03oct05   03oct06   03oct07   03oct08   03oct09   03oct10   03oct11 
          ---------------------------------------------------------------------
ALGO        38/2426   46/2422   52/2417   52/2415   47/2414   47/2419   49/2415 
AREQ         0/   0   23/1808   24/1971   25/1998   22/1653   27/1728   25/1825 
AUCK         0/   0   50/1719   49/1928   47/2009   50/1677   50/2029   48/1970 
BAHR         0/   0   40/2055   40/2173   38/2054   41/1889   37/2060   40/2415 
BRAZ         0/   0   56/1870   58/1713    0/   0    0/   0    0/   0    0/   0 
CAS1         0/   0   28/2178   29/2252   28/2417   27/2493   28/2452   27/2443 
CEDU         0/   0   39/2400   44/1934   40/2197   35/2035   36/2465   37/1910 
COCO         0/   0    0/   0   25/2497   27/2181   27/2404   25/2129   25/2207 
CORD        61/1410   62/1908    0/   0    0/   0    0/   0    0/   0    0/   0 
CRO1         0/   0    0/   0    0/   0    0/   0    0/   0    0/   0   45/1725 
DAV1         0/   0   30/2229   31/2416   31/2406   32/2490   30/2416   32/2418 
DRAO        38/2494   34/2059   35/2144   38/2164   37/1944   39/2252   35/2398 
EISL         0/   0   60/1786    0/   0   60/1795   59/1593   57/1650   58/1352 
FAIR        28/2454   38/2273   32/2304   29/2155   30/2282   48/2388   24/2486 
GRAZ        66/1849   59/ 640   62/ 890   65/2172   64/1782   64/1977   67/2107 
GUAM         0/   0    0/   0    0/   0   46/1859    0/   0    0/   0    0/   0 
GUAT         0/   0    0/   0    0/   0   68/2156    0/   0   67/1414    0/   0 
HOB2         0/   0   35/2078    0/   0    0/   0    0/   0    0/   0    0/   0 
HRAO        19/2105   19/1984   19/1609   19/1837    0/   0    0/   0    0/   0 
IRKT        60/1883    0/   0   58/2261   54/2159   55/1836   52/1544   55/1958 
KELY        33/1991   29/1326   34/1983   35/2334   34/2029   35/2179   35/2217 
KERG        55/1822   51/1802   42/1845   55/1884   51/1753   52/1473   54/2104 
KIT3         0/   0    0/   0    0/   0    0/   0    0/   0   54/1487    0/   0 
KOUR         0/   0   26/1452   32/2190    0/   0    0/   0    0/   0    0/   0 
LHAS         0/   0    0/   0   34/2147   32/1895   32/1724    0/   0    0/   0 
LPGS         0/   0    0/   0   59/1725   56/1222   58/1359   59/1442   63/1521 
MAC1         0/   0   38/1878   36/1980   36/1960   33/1923   38/2224   38/1998 
MAG0         0/   0    0/   0    0/   0    0/   0   44/2015   47/2129   44/2146 
MAS1         0/   0   27/1933   30/2357   28/2173   27/2086   29/2200   28/2084 
MKEA        23/2113   23/1795   23/1837   24/2291   23/1878   23/2199   25/1971 
NRC1        36/2244   39/2353   38/2364   44/2361   44/2209   48/2427   48/2427 
NRIL        24/2736   24/2364   24/2607   23/2450   21/2097   21/2572   22/2046 
NYAL        37/2709   37/2555   36/2638   36/2464   37/2655   39/2635   38/2680 
OHI2        32/2550   34/2581   33/2637   31/2554   33/2317   33/2459   34/2241 
PERT         0/   0   38/2210   38/2311   38/2291   39/2314   39/2318   38/2402 
PIE1         0/   0   46/1892   44/1972   45/2047   45/2053   45/2059   47/1678 
PIMO         0/   0    0/   0    0/   0    0/   0    0/   0   25/1724   25/1937 
POL2        30/2086   31/2309   31/2080   33/1195    0/   0    0/   0    0/   0 
STJO        30/2179   31/2146   32/2335   33/2414   30/2227   31/2473   30/2473 
TSKB        26/2223   27/2349   26/2151   27/2261   28/2083    0/   0    0/   0 
USNO         0/   0   39/1114    0/   0   48/2009   48/2107   48/2184   44/1942 
USUD        32/2039   32/2148   33/2149   32/2152   31/2030   33/2125   32/1855 
VILL         0/   0   26/1926   24/2177   25/2276   26/2166   26/2280   25/1919 
YELL        40/2537   43/2234   36/2252   38/2250   40/2185   39/2453   38/2424 
ZAMB         0/   0    0/   0    0/   0    0/   0   48/1322   64/1462   52/2082 

PRN01       38/1628   35/2546   37/2775   37/2839   42/2600   43/2620   42/2463 
PRN02       43/1638   39/2423   44/2710   42/2898   40/2800   45/2868   43/2619 
PRN03       39/1594   36/2553   35/2775   40/2894   39/2768   42/2809   40/2790 
PRN04       35/1430   37/2724   36/2867   39/2984   35/2603   42/2973   37/2869 
PRN05       45/ 720   40/1122   33/1730   34/1481   36/1806   37/1826   35/1721 
PRN06       39/1394   37/2656   38/2859   37/2869   37/2660   40/3056   41/2653 
PRN07       39/1656   38/2598   34/2732   38/2926   38/2566   41/2788   38/2484 
PRN08       34/1733   35/2886   36/2543   40/3007   40/2911   39/2852   38/2933 
PRN09       36/1808   34/2790   34/3057   38/3174   39/3049   40/3105   38/2924 
PRN10 E     39/1498   40/2554   39/2199   40/2648   40/2357   43/2458   42/2578 
PRN11       37/1610   41/2215   39/2841   46/2703   42/2575   44/2583   43/2363 
PRN13       40/1017   44/1808   40/1973   41/2219   42/1691   46/1980   44/2071 
PRN14       40/1292   39/1669   36/2623   43/2480   39/2076   39/2143   41/2307 
PRN15       37/1385   41/2623   38/2908   40/2897   40/2862   43/2805   39/2706 
PRN16 E     37/1437   39/2116   38/2492   40/2469   38/1912   44/1821   41/2514 
PRN17       40/1469   39/2718   38/2631   40/2871   37/2330   44/2998   44/2834 
PRN18 E     38/1472   34/2387   32/2241   37/2722   36/2371   37/2211   39/2395 
PRN20 E     44/1476   41/2221   40/2564   45/2815   44/2486   45/2721   44/2812 
PRN21       38/1532   39/2398   38/2354   39/2721   41/2161   41/2296   38/2508 
PRN23 E     39/1386   37/1755   38/1880   46/1529   39/1131   41/2431   40/1978 
PRN24       38/1400   38/2601   35/2705   42/2965   35/2472   43/2789   40/2805 
PRN25       38/1612   36/2554   37/2539   40/2916   38/2599   38/2598   41/2660 
PRN26       34/1808   35/2800   35/2668   36/2974   37/2815   38/2780   35/2688 
PRN27       36/1594   40/2608   36/2502   40/2856   38/2766   41/2559   40/2877 
PRN28 E     36/1407   43/2559   44/2630   42/2732   43/2423   44/2679   42/2723 
PRN29       32/1817   34/2786   36/2667   35/2929   36/2684   37/2818   35/1676 
PRN30 E     43/1349   40/2429   40/2870   40/2829   39/2576   41/2973   42/2943 
PRN31       38/1688   36/2677   35/2911   40/3110   37/2974   41/2887   38/2882 


                         Station Clock Offsets Solution for 0h UT
                               (microsecond / sigma in ns)

       03oct05   03oct06   03oct07   03oct08   03oct09   03oct10   03oct11  sig 
       ------------------------------------------------------------------------
ALGO       REF       REF       REF       REF       REF       REF       REF   --
AREQ       ---    -.4242    -.4305    -.4336    -.4436    -.4419    -.4415   .4
AUCK       ---    -.4459*   -.4379*   -.4587*   -.4544*   -.4555*   -.4709*  .4
BAHR       ---  775.0801  775.0630  775.0475  775.0365  775.0243  775.0139   .2
BRAZ       ---   46.4493* 473.9509*      ---       ---       ---       ---   .3
CAS1       ---    -.3242    -.3324    -.3373*   -.3528    -.3431    -.3581   .3
CEDU       ---    -.3426    -.3395    -.3484    -.3505    -.3497    -.3592   .2
COCO       ---       ---    -.3322    -.3463    -.3478    -.3615    -.3710   .2
CORD    -.3203    -.3190       ---       ---       ---       ---       ---   .3
CRO1       ---       ---       ---       ---       ---       ---    -.4447   .3
DAV1       ---    -.3316    -.3401    -.3581    -.3483    -.3346    -.3490   .2
DRAO   -1.2176   -1.2486   -1.2789   -1.3083   -1.3380   -1.3662   -1.3933   .2
EISL       ---    -.4025       ---    -.4227    -.4238    -.4388    -.4454   .4
FAIR  942.7006  942.6705  942.6379  942.6064  942.5737  942.5438  942.5155   .2
GRAZ  389.4371       ---       ---  667.4554  426.4562  185.4161  944.0250   .3
GUAM       ---       ---       ---    -.4532       ---       ---       ---   .3
GUAT       ---       ---       ---  428.7758       ---  806.9714       ---   .3
HOB2       ---    1.4612       ---       ---       ---       ---       ---   .2
HRAO  565.2327  565.1811  565.1230  565.0655       ---       ---       ---   .3
IRKT    -.5642       ---    -.5949    -.6087    -.6214    -.6323*   -.6939   .3
KELY    -.3882    -.4055* 473.9828*   -.4149    -.4011*   -.4258    -.4282*  .3
KERG  457.7151* 457.5656* 457.3965* 457.2345* 457.0722* 456.9196* 456.7592*  .3
KIT3       ---       ---       ---       ---       ---    -.3330       ---   .5
KOUR       ---  578.4744  578.3447       ---       ---       ---       ---   .3
LHAS       ---       ---    -.3435    -.3338    -.3467       ---       ---   .2
LPGS       ---       ---    -.3414    -.3445    -.3664    -.3580    -.3474   .5
MAC1       ---    -.3315    -.3399    -.3475    -.3560    -.3430    -.3831   .3
MAG0       ---       ---       ---       ---    -.4281*   -.4270*   -.4409*  .2
MAS1       ---  161.5500  161.4797  161.4174  161.3487  161.2831  161.2289   .3
MKEA    -.4343    -.4646    -.4531    -.4758    -.4715    -.4734    -.4886   .2
NRC1    -.3144    -.3191    -.3239    -.3272    -.3312    -.3328    -.3339   .2
NRIL    -.3820    -.3984    -.4086    -.4153    -.4224    -.4203    -.4338   .2
NYAL   -1.0601   -1.0674   -1.0742   -1.0809   -1.0871   -1.0937   -1.1004   .2
OHI2    -.2887    -.3062    -.3233    -.3478    -.3455    -.3513    -.3581   .2
PERT       ---    -.3998    -.4147    -.4170    -.4224    -.4207    -.4327   .2
PIE1       ---    -.2646    -.1850    -.2014    -.2186    -.2337    -.2484   .3
PIMO       ---       ---       ---       ---       ---    -.4597    -.4540   .5
POL2    -.3704    -.3765    -.3872    -.3978       ---       ---       ---   .3
STJO    -.3911    -.4717    -.5529    -.6344    -.7168    -.7986    -.8785   .2
TSKB    -.0879    -.0898    -.1068    -.1352    -.1423       ---       ---   .2
USNO       ---     .3261       ---     .3093     .3014     .2950     .2894   .2
USUD    -.3997    -.4148    -.4217    -.4259    -.4192    -.4204    -.4378   .2
VILL       ---  905.9741  905.4760  904.9797  904.5226  904.1329  903.7112   .2
YELL    1.8097    1.8558    1.9028*   1.9477    1.9930    2.0400    2.0887   .3
ZAMB       ---       ---       ---       ---    -.3325    -.3593    -.3545   .3
  
  
Notes: * indicates epoch other than 0h UT
       Sig are sigmas, in ns, averaged over 7 days
       !!ms!! indicates offsets greater than 1 millisecond
 
global: ALGO AREQ ASC1 AUCK BAHR BRAZ CAS1 CEDU COCO CORD CRO1 DAV1 DRAO EISL
global: FAIR FORT GOUG GRAZ GUAM GUAT HOB2 HRAO IRKT KELY KERG KIT3 KOUR LHAS
global: LPGS MAC1 MAG0 MANA MAS1 MCM4 MKEA NRC1 NRIL NYAL OHI2 PERT PIE1 PIMO
global: POL2 SSIA STJO THTI TSKB USNO USUD VILL YELL ZAMB



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