[IGSREPORT-14512] Wk 1402 EMR Analysis Report
Brian Donahue
bdonahue at geod.nrcan.gc.ca
Thu Nov 30 12:08:00 PST 2006
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IGS Electronic Report 30 Nov 12:08:04 PST 2006 Message Number 14512
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Author: NRCan/GSDivision
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EMR ANALYSIS REPORT GPS-WEEK 1402 Dates: 06nov19 to 06nov25
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NRCan (Natural Resources Canada, formerly Energy, Mines and Resources (EMR))
615 Booth Street, Ottawa, Canada K1A 0E9
e-mail: bdonahue at geod.nrcan.gc.ca, pierre at geod.nrcan.gc.ca, huot at geod.nrcan.gc.ca
tel: (613)947-4246 (Brian Donahue)
(613)992-2218 (Pierre Tetreault)
fax: (613)995-3215
PRODUCTS GENERATED:
The following products are generated and uploaded into CDDIS @ NASA/GSFC
EMR14020-6.SP3 GPS ephem. files for days 0-6, week #1402 in sp3 format
EMR14027.ERP pole x,y and DUT1 solutions for week #1402
EMR14027.SNX station and EOP weekly combined solution in SINEX format
EMR14027.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).
NRC1 clock error & drift were about -59.2 ns (54058) & 0.9 ns/day w.r.t.
GPS time
2. Date | PRN | Action | Period | Reason
+--------+-------+--------+----------------+----------------------------+
06nov23 29 E 00:00 to 23:45 Modeling problems
+--------+-------+--------+----------------+----------------------------+
(R) Satellite was removed from EMR SP3 file.
(E) Satellite was excluded prior to processing data.
(M) Satellite in maneuver.
SOLUTION CHARACTERISTICS
1. Solution identifier: Submission 061130
2. Software used : GIPSY/OASIS II (UNIX )
3. Definition of Terrestrial frame:
origin and orientation : Nominally IGS05
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
06nov19 06nov20 06nov21 06nov22 06nov23 06nov24 06nov25
---------------------------------------------------------------------
ALGO .38/2596 .41/2523 .42/2601 .42/2608 .42/2254 .41/2350 .42/2485
AREQ .49/2260 .44/2191 .44/2229 .41/2175 .36/2022 .47/2090 .52/2258
ARTU .42/2665 .46/2392 .00/ 0 .47/1749 .43/2253 .41/2521 .43/2423
BAHR .00/ 0 .00/ 0 .00/ 0 .50/2619 .00/ 0 .00/ 0 .00/ 0
BILI .51/2670 .00/ 0 .00/ 0 .00/ 0 .00/ 0 .00/ 0 .00/ 0
CAS1 .45/2689 .43/2813 .45/2792 .46/2756 .45/2559 .47/2687 .45/2607
CHAT .58/2468 .51/2576 .52/2574 .51/2303 .53/2102 .56/2419 .54/2347
CHPI .57/2333 .66/2231 .74/2375 .59/2366 .54/2491 .67/2394 .57/2226
COCO .56/2741 .54/2741 .57/2754 .57/2619 .47/2669 .54/2740 .52/2733
CRO1 .71/2460 .80/2136 .74/2275 .00/ 0 .00/ 0 .00/ 0 .00/ 0
DRAO .51/2626 .46/2542 .47/2644 .45/2647 .42/2553 .42/2533 .41/2552
GLPS .53/2680 .49/2791 .48/2465 .47/2689 .48/2422 .50/2813 .48/2601
GOUG .00/ 0 .60/1085 .00/ 0 .00/ 0 .00/ 0 .00/ 0 .00/ 0
GRAZ .51/2457 .48/2459 .46/2202 .48/2371 .49/2334 .51/2314 .50/2510
HOFN .56/2801 .60/2804 .55/2532 .56/2708 .73/2554 .70/2703 .58/2660
IISC .64/2506 .63/1936 .68/2495 .62/2503 .63/2132 .64/2771 .64/2616
IRKT .52/2051 .00/ 0 .00/ 0 .00/ 0 .00/ 0 .00/ 0 .00/ 0
ISPA .62/2228 .62/2401 .60/2607 .59/2515 .52/2234 .60/2532 .65/2278
KOKB .00/ 0 .00/ 0 .00/ 0 .61/2210 .00/ 0 .00/ 0 .00/ 0
KOUR .76/2564 .78/1813 1.04/2420 .87/2145 .00/ 0 .00/ 0 .00/ 0
KUNM .68/1993 .73/2020 .71/2216 .65/2080 .64/2068 .70/1928 .70/2054
LPGS .56/2093 .55/1981 .58/1918 .58/2140 .64/1934 .67/1966 .63/1948
MAC1 .37/2714 .37/2592 .43/2688 .46/2507 .58/2441 .64/2633 .61/2553
MAS1 .48/2333 .48/2331 .42/2453 .45/2299 .44/2340 .42/2290 .64/2294
MBAR .66/2937 .60/2927 .59/2913 .54/2687 .52/2860 .59/2937 .61/2508
MCM4 .50/2090 .46/2718 .46/2807 .50/2489 .48/2336 .46/2446 .46/2342
MDO1 .42/2290 .42/2190 .46/2261 .43/2081 .44/2160 .45/2090 .48/2096
MKEA .72/1981 .74/2581 .72/2380 .00/ 0 .71/2305 .77/2578 .71/2559
NOUM .69/2473 .68/2286 .61/2629 .57/2458 .60/2470 .66/2377 .61/2631
NRC1 .40/2622 .41/2620 .40/2629 .40/2633 .39/2548 .39/2631 .38/2623
NYAL .48/2973 .47/3089 .45/2826 .44/3137 .42/2863 .43/3015 .43/2902
OHI2 .44/2550 .45/2557 .45/2367 .43/2705 .44/2657 .45/2478 .52/2483
PERT .58/2642 .53/2641 .47/2170 .47/2396 .49/2358 .52/2611 .52/2416
PETS .00/ 0 .00/ 0 .00/ 0 .48/2442 .47/2383 .49/2488 .48/2488
PIMO .00/ 0 .00/ 0 .00/ 0 .00/ 0 .61/2249 .66/2477 .69/2540
POL2 .44/2597 .44/2604 .42/2487 .40/2502 .39/2517 .40/2596 .42/2461
RAMO .51/2331 .49/2592 .49/2326 .49/2487 .51/2541 .53/2601 .53/2486
STJO .56/2643 .59/2564 .44/2650 .45/2382 .44/2431 .48/2410 .42/2549
SUTH .68/2279 .63/2409 .54/2246 .54/2394 .52/2365 .54/2536 .47/2536
SYOG .53/2678 .49/2663 .51/2678 .54/2503 .60/2252 .65/2316 .65/2574
THTI .00/ 0 .00/ 0 .00/ 0 .00/ 0 .00/ 0 .00/ 0 .76/2501
THU3 .41/3066 .41/3059 .40/2844 .40/3131 .40/2927 .41/3011 .41/3108
TIDB .50/2559 .51/2511 .52/2493 .58/2269 .56/2351 .58/2402 .57/2172
TOW2 .59/2758 .51/2763 .46/2594 .51/2804 .47/2525 .51/2739 .49/2724
TSKB .48/2808 .48/2738 .46/2812 .45/2743 .46/2734 .47/2747 .46/2741
ULAB .00/ 0 .49/2629 .47/2071 .46/2654 .45/2226 .45/2569 .44/2266
USNO .53/2565 .53/2499 .54/2335 .61/2506 .58/1971 .56/2422 .53/2300
VILL .39/1608 .41/1602 .41/1422 .41/1405 .38/1390 .38/1245 .00/ 0
YELL .40/2767 .40/2804 .35/2796 .37/2814 .33/2413 .36/2635 .37/2697
YIBL .00/ 0 .00/ 0 .00/ 0 .00/ 0 .48/1627 .51/2522 .52/2193
PRN01 .53/3776 .52/3749 .50/3584 .48/3763 .49/3831 .50/3810 .53/3864
PRN02 E .54/4013 .55/4068 .52/3966 .50/3883 .51/3224 .52/3014 .53/3375
PRN03 .55/3526 .54/3486 .51/3409 .51/3493 .51/3524 .55/3509 .56/3591
PRN04 E .52/3585 .54/3378 .55/3691 .49/3134 .53/2756 .54/2149 .57/1967
PRN05 .52/3619 .52/3715 .50/3451 .50/3659 .48/3448 .53/3699 .51/3649
PRN06 .59/3732 .56/3768 .56/3645 .50/3813 .48/3563 .51/3789 .49/3691
PRN07 .52/3394 .53/3529 .52/3471 .50/3666 .52/3687 .50/3723 .49/3744
PRN08 .52/3513 .50/3375 .52/3523 .53/3631 .50/3447 .51/3579 .53/3464
PRN09 .52/3292 .53/3338 .52/3266 .50/3273 .51/3396 .57/3392 .56/3365
PRN10 .54/3905 .54/3893 .57/3811 .54/3846 .49/3624 .52/3711 .55/3804
PRN11 E .57/3552 .55/3519 .57/3381 .45/1688 .50/3552 .56/3550 .54/3266
PRN13 .52/3910 .52/3483 .58/3797 .48/3769 .48/3448 .53/3953 .53/3825
PRN14 .55/3603 .56/3559 .52/3457 .48/3515 .53/3630 .55/3602 .55/3605
PRN15 E .44/1461 .44/1392 .51/1564 .52/1399 .44/1288 .45/1315 .48/ 909
PRN16 .52/3683 .58/3597 .53/3496 .54/3750 .52/3781 .52/3803 .55/3796
PRN17 .53/3436 .55/3612 .56/3731 .53/3671 .52/3453 .53/3543 .52/3436
PRN18 .54/3504 .51/3443 .52/3366 .51/3580 .48/3421 .52/3574 .52/3663
PRN19 .54/3523 .51/3399 .54/3251 .51/3213 .56/2538 .56/3440 .55/3576
PRN20 .54/3785 .54/3797 .53/3732 .54/3700 .50/3814 .52/3865 .54/3822
PRN21 E .50/3355 .48/2512 .49/3388 .49/3496 .48/3507 .56/3589 .53/3603
PRN22 .53/3583 .52/3438 .53/3511 .51/3664 .51/3629 .55/3567 .52/3533
PRN23 .53/3765 .51/3504 .56/3579 .54/3881 .51/3897 .52/3889 .53/3879
PRN24 E .68/3493 .59/3403 .64/3635 .60/3070 .60/3117 .69/3365 .68/3292
PRN25 .56/3743 .52/3719 .52/1748 .49/3615 .48/3726 .52/3836 .53/3902
PRN26 .51/3294 .51/3585 .46/1941 .50/3532 .49/3192 .52/3449 .54/3552
PRN27 .50/3428 .51/3367 .51/3443 .50/3652 .50/3620 .50/3582 .51/3623
PRN28 .51/3391 .52/3239 .54/3458 .50/3532 .48/3366 .51/3509 .48/3254
PRN29 .52/3042 .48/3309 .54/3392 .51/3590 .00/ 0 .52/3345 .55/3567
PRN30 .55/3601 .55/3542 .54/3434 .50/3634 .49/3532 .51/3626 .52/3642
PRN31 .55/3638 .58/3686 .49/1855 .50/3519 .52/3810 .55/3786 .54/3782
Pseudo Range Statistics
rms (cm) / # obs
06nov19 06nov20 06nov21 06nov22 06nov23 06nov24 06nov25
---------------------------------------------------------------------
ALGO 32/2596 31/2523 40/2601 37/2608 45/2254 38/2350 39/2485
AREQ 22/2262 21/2191 22/2229 20/2175 22/2022 23/2090 25/2259
ARTU 25/2665 26/2392 0/ 0 26/1695 25/2253 25/2521 25/2423
BAHR 0/ 0 0/ 0 0/ 0 38/2619 0/ 0 0/ 0 0/ 0
BILI 39/2670 0/ 0 0/ 0 0/ 0 0/ 0 0/ 0 0/ 0
CAS1 46/2689 46/2813 47/2792 48/2756 45/2559 43/2687 43/2607
CHAT 0/ 0 0/ 0 71/2574 0/ 0 0/ 0 0/ 0 69/2347
CHPI 50/2334 51/2232 51/2377 51/2368 50/2492 50/2394 51/2226
COCO 42/2741 42/2741 45/2754 44/2619 45/2669 44/2740 44/2733
CRO1 39/2460 36/2142 34/2284 0/ 0 0/ 0 0/ 0 0/ 0
DRAO 41/2626 42/2542 42/2644 43/2647 44/2553 45/2533 43/2552
GLPS 36/2680 35/2791 36/2465 35/2689 35/2422 35/2813 36/2601
HOFN 59/2801 61/2805 60/2532 59/2708 55/2554 59/2703 58/2660
IISC 62/2506 59/1936 60/2495 61/2503 60/2132 61/2771 60/2616
IRKT 59/2051 0/ 0 0/ 0 0/ 0 0/ 0 0/ 0 0/ 0
ISPA 25/2228 23/2401 25/2607 27/2515 25/2234 24/2532 24/2280
KOKB 0/ 0 0/ 0 0/ 0 33/2210 0/ 0 0/ 0 0/ 0
KOUR 44/2569 36/1817 33/2438 33/2148 0/ 0 0/ 0 0/ 0
KUNM 0/ 0 0/ 0 81/2216 0/ 0 0/ 0 0/ 0 0/ 0
LPGS 58/2093 56/1981 56/1918 56/2141 55/1934 50/1969 51/1949
MAC1 40/2714 40/2592 43/2688 42/2507 44/2441 50/2634 48/2557
MAS1 53/2333 54/2331 54/2456 53/2299 53/2340 54/2290 54/2295
MBAR 33/2940 33/2930 33/2914 31/2687 32/2860 31/2939 34/2511
MCM4 21/2090 23/2718 28/2807 27/2489 33/2336 29/2446 27/2342
MDO1 57/2289 56/2190 52/2262 55/2081 59/2160 57/2090 58/2096
MKEA 29/1983 30/2583 34/2381 0/ 0 31/2309 28/2581 29/2559
NOUM 0/ 0 0/ 0 78/2629 0/ 0 0/ 0 0/ 0 0/ 0
NRC1 40/2622 37/2621 47/2629 53/2633 55/2548 53/2631 55/2623
NYAL 36/2973 36/3089 37/2826 35/3137 35/2863 35/3015 36/2902
OHI2 35/2550 36/2559 37/2367 35/2705 35/2657 35/2480 38/2483
PERT 0/ 0 0/ 0 70/2169 0/ 0 0/ 0 0/ 0 67/2416
PETS 0/ 0 0/ 0 0/ 0 55/2442 55/2383 58/2488 57/2488
PIMO 0/ 0 0/ 0 0/ 0 0/ 0 24/2249 24/2477 24/2540
POL2 30/2597 35/2604 33/2487 34/2503 33/2517 33/2596 33/2461
RAMO 45/2331 52/2592 56/2326 44/2487 44/2541 51/2601 51/2486
STJO 37/2643 36/2564 36/2650 37/2382 36/2431 38/2410 36/2549
SUTH 24/2279 28/2409 28/2246 25/2394 26/2365 25/2536 25/2536
SYOG 56/2678 54/2661 55/2677 57/2502 57/2252 52/2316 56/2573
THTI 0/ 0 0/ 0 0/ 0 0/ 0 0/ 0 0/ 0 61/2505
THU3 44/3066 44/3059 44/2844 43/3131 43/2927 43/3011 44/3108
TIDB 42/2558 37/2510 40/2493 41/2269 40/2352 36/2402 41/2177
TOW2 41/2758 41/2763 42/2594 41/2804 42/2526 41/2739 41/2724
TSKB 28/2808 29/2738 31/2812 29/2743 27/2734 30/2747 29/2741
ULAB 0/ 0 59/2629 59/2071 58/2654 57/2226 59/2570 56/2266
USNO 50/2565 53/2499 52/2334 50/2506 49/1971 51/2422 56/2299
VILL 0/ 0 0/ 0 85/1421 0/ 0 0/ 0 0/ 0 0/ 0
YELL 36/2767 35/2804 34/2796 34/2814 32/2413 34/2635 34/2697
PRN01 37/3192 36/3105 44/3482 39/3188 38/3158 38/3168 40/3412
PRN02 E 41/3519 40/3512 45/3858 41/3398 43/2793 42/2524 43/3030
PRN03 39/2993 39/2950 47/3344 41/3048 40/3027 42/3050 44/3256
PRN04 E 43/3212 42/2959 49/3598 45/2918 48/2345 46/1778 46/1770
PRN05 42/3219 41/3282 45/3381 41/3272 41/3054 41/3279 45/3429
PRN06 39/3300 42/3305 46/3577 43/3378 41/3145 42/3306 43/3423
PRN07 44/2930 45/3068 51/3398 43/3213 43/3173 43/3219 44/3469
PRN08 39/3077 41/2885 45/3426 43/3197 42/2904 42/3032 43/3143
PRN09 42/2851 42/2901 46/3201 42/3098 41/2920 40/2904 43/3114
PRN10 41/3466 40/3417 49/3713 39/3411 41/3173 41/3206 44/3505
PRN11 E 42/3063 41/3008 49/3294 43/1428 43/2969 42/2986 49/2943
PRN13 46/3439 44/3084 51/3686 46/3274 47/3063 45/3387 47/3500
PRN14 43/3006 43/2914 47/3373 41/2917 43/2995 43/2971 47/3218
PRN15 E 39/1293 46/1223 45/1564 44/1347 41/1234 40/1155 43/ 909
PRN16 44/3203 45/3082 51/3415 44/3279 44/3221 45/3247 46/3417
PRN17 42/2954 41/3067 50/3629 43/3200 44/2920 44/3036 47/3183
PRN18 42/2930 43/2821 44/3286 43/3045 42/2861 43/2979 46/3287
PRN19 54/3022 50/2968 65/3189 53/2723 51/2152 52/2988 54/3251
PRN20 43/3354 42/3317 50/3634 42/3204 43/3266 43/3275 48/3480
PRN21 E 42/2831 44/1944 47/3324 43/2987 43/2984 44/2998 47/3253
PRN22 38/2990 38/2936 47/3448 41/3066 41/2992 40/2976 44/3170
PRN23 44/3286 43/3067 48/3476 44/3411 45/3236 45/3248 46/3455
PRN24 E 40/3066 38/2917 45/3549 42/2705 41/2736 39/2879 44/2982
PRN25 39/3204 40/3127 43/1748 42/3064 40/3080 40/3217 44/3463
PRN26 41/2957 42/3115 44/1941 41/3106 39/2917 40/2968 43/3254
PRN27 38/2975 39/2864 43/3346 42/3194 42/3034 41/3075 43/3252
PRN28 41/3067 40/2875 47/3379 46/3134 45/2871 42/3015 45/3091
PRN29 40/2864 40/2845 45/3327 41/3164 0/ 0 40/2963 43/3268
PRN30 45/3177 44/3115 54/3364 44/3154 45/3093 46/3165 47/3388
PRN31 42/3075 43/3079 48/1855 42/3047 43/3163 45/3165 46/3357
Station Clock Offsets Solution for 0h UT
(microsecond / sigma in ns)
06nov19 06nov20 06nov21 06nov22 06nov23 06nov24 06nov25 sig
------------------------------------------------------------------------
ALGO .0690 .0812 .0929 .1039 .1154 .1270 .1367 .3
AREQ -.0141 -.0134 .0005 .0138 .0086 -.0071 -.0089 .3
ARTU .0053 .0050 --- .0138 .0001 -.0004 .0058 .4
BAHR --- --- --- 190.5679 --- --- --- .2
BILI -.0226* --- --- --- --- --- --- .2
CAS1 .0192 .0042 -.0058 .0048 .0057 .0058 .0000 .3
CHAT --- --- -.0202* --- --- --- .0001 .4
CHPI -.0233 -.0248 -.0232 -.0132 -.0102 -.0156 -.0138 .4
COCO -.0003 .0009 .0124 .0101 .0068 .0081 .0191 .2
CRO1 627.0932 627.0937 627.0938 --- --- --- --- .2
DRAO .1420* -.1349 -.4145 -.6953 -.9754 .5506 .2705 .2
GLPS -.0255 -.0215 -.0253 -.0303 -.0216 -.0511 -.0335 .2
HOFN 944.1598* 840.1680* 742.4444* 630.9892* 507.8166* 405.0067* 286.8931 .2
IISC .0197 .0278 .0273 .0226 .0265 .0284 .0304 .3
IRKT .2260 --- --- --- --- --- --- .8
ISPA -.0311* -.0216 -.0071 -.0161 -.0237 -.0511 -.0365 .3
KOKB --- --- --- 606.4431 --- --- --- .2
KOUR .0439 .0339 -324.3165 -324.3158 --- --- --- .3
KUNM --- --- .1695 --- --- --- --- .2
LPGS .0646 .1241 .1745 .1153 .1056 .0931 .0822 .2
MAC1 -.0006 -.0007 -.0093 -.0006 -.0069 -.0010 .0050 .2
MAS1 -.0105 -.0105 -.0046 -.0076 -.0050 -.0097 -.0057 .2
MBAR -.0390 -.0427 -.0244 -.0352 -.0344 -.0386 -.0394 .3
MCM4 150.8812 227.4445 304.2507 380.9848 457.5392 534.1854 611.0683 .3
MDO1 4.2050 4.8051 5.8920 .0204 -.0277 -.7569 -2.1093 .2
MKEA -3.9636 -.0628 -.0371 --- -.0381 -.0503 -.0181* .3
NOUM --- --- -113.2377 --- --- --- --- .2
NRC1 REF REF REF REF REF REF REF --
NYAL -.5411 -.5722 -.6046 -.6387 -.6739 -.7082 -.7419 .2
OHI2 .0768 .0636 .0522 .0687 .0522 .0608 .0682 .2
PERT --- --- 63.3883 --- --- --- 62.4111 .2
PETS --- --- --- -.0054 -.0059 -.0069 -.0041 .2
PIMO --- --- --- --- .0168 .0021 .0007 .3
POL2 .0128 .0155 .0222 .0308 .0239 .0311 .0277 .2
RAMO -.0142 -.0161 -.0190 -.0226 -.0173 -.0212 -.0256 .2
STJO -.0416 -.0683 -.0950 -.1210 -.1466 -.1705 -.1918 .2
SUTH .0121 .0188 .0114 .0110 .0094 .0050 .0187 .2
SYOG 166.4539* 166.4514 166.4558 166.4610 166.4662 166.4677 166.4732 .3
THTI --- --- --- --- --- --- 516.1448 .2
THU3 .0036 .0073 .0020 .0114 .0066 .0191 .0185 .2
TIDB 785.3618 785.3856 785.4116 785.4324 785.4176 785.4033 785.3914 .6
TOW2 -.0213 -.0143 -.0141 .0011 -.0121 -.0073 -.0138 .2
TSKB .0514 .0520 .0437 .0404 .0519 .0585 .0612 .2
ULAB --- .0380 .0338 .0715 .0443 .0434 .0288 .4
USNO .7086 .7093 .7097 .7101 .7109 .7115 .7139 .2
VILL --- --- .0176 --- --- --- --- .4
YELL 9.0109 9.1355 9.2601 9.3843 9.5096 9.6354 9.7612 .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 ARTU BAHR BILI CAS1 CHAT CHPI COCO CRO1 DRAO GLPS GOUG GRAZ
global: HOFN IISC IRKT ISPA KOKB KOUR KUNM LPGS MAC1 MAS1 MBAR MCM4 MDO1 MKEA
global: NOUM NRC1 NYAL OHI2 PERT PETS PIMO POL2 RAMO STJO SUTH SYOG THTI THU3
global: TIDB TOW2 TSKB ULAB USNO VILL YELL YIBL
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