[IGSREPORT-13552] Wk 1361 NCL GNAAC g-network Report
David Lavallee
D.A.Lavallee at newcastle.ac.uk
Thu Feb 23 06:57:20 PST 2006
******************************************************************************
IGS Electronic Report 23 Feb 06:57:35 PST 2006 Message Number 13552
******************************************************************************
Author: David Lavallee
=SCR 2.01 NCL 06:054:53516 COM 06:035:00000 06:043:86370
------------------------------------------------------------------------
--------
DESCRIPTION A-Sinex comparison report, gps week 1361
OUTPUT NCL Univeristy of Newcastle upon Tyne
CONTACT David Lavallee (d.a.lavallee at ncl.ac.uk)
SOFTWARE Tanyak
HARDWARE Linux 2.6.14-1.1637_FC4smp i686 GNU/Linux
INPUT cod emr esa gfz jpl mit ngs
------------------------------------------------------------------------
--------
1) Notes
The submitted G-Sinex is the GNET solution constrained to CORE.
GNET is the NCL loose combination of deconstrained AC-solutions.
CORE is core_IGSb00.snx; the IGS realisation of ITRF2000 Core
Variance scaling factors applied
Starting week 1159 the ERP combination is made and submitted within
Sinex file.
------------------------------------------------------------------------
--------
2) Input and output Sinex in NCL analysis for week 1361
Type Agency Filename____ Sinex_ID________
A cod cod13617.snx COD 06:047:28251
A emr emr13617.snx NRC 06:051:75399
A esa esa13617.snx ESA 06:051:30370
A gfz gfz13617.snx GFZ 06:047:33120
A jpl jpl13617.snx JPL 06:048:44262
A mit mit13617.snx MIT 06:048:38657
A ngs ngs13617.snx NOA 06:053:28415
G NCL ncl1361g.snx NCL 06:054:53295
------------------------------------------------------------------------
--------
3) Common station set sizes
cod emr esa gfz jpl mit ngs GNET CORE
cod 170 33 53 133 93 102 121 134 82
emr 39 27 36 31 33 35 39 31
esa 64 62 47 58 60 63 55
gfz 185 108 112 135 149 89
jpl 125 80 94 105 58
mit 135 102 115 74
ngs 144 138 87
GNET 157 90
CORE 96
------------------------------------------------------------------------
--------
4) Postfit residuals RMS (mm)
emr esa gfz jpl mit ngs GNET CORE
cod 3.95 6.45 4.07 20.32 5.26 7.03 3.03 11.26
emr 6.73 4.79 8.96 5.49 6.09 2.92 10.92
esa 6.70 7.37 6.16 9.37 5.65 9.44
gfz 18.00 4.21 7.08 2.52 10.03
jpl 11.60 13.59 17.89 12.68
mit 6.95 4.06 9.50
ngs 6.33 11.90
GNET 10.08
------------------------------------------------------------------------
--------
5) Postfit residuals Weighted RMS (mm)
emr esa gfz jpl mit ngs GNET CORE
cod 2.23 3.82 2.09 5.60 3.01 3.76 1.73 8.90
emr 3.74 2.44 4.73 2.35 4.05 1.78 6.99
esa 3.88 4.05 3.75 4.66 3.13 7.64
gfz 5.03 2.25 3.73 1.44 7.92
jpl 5.20 5.70 4.77 9.12
mit 4.41 2.41 7.43
ngs 3.16 6.20
GNET 7.50
------------------------------------------------------------------------
--------
6) 7 parameters from deconstrained A-Sinexes to GNET
Tx Ty Tz S Rx Ry
Rz
(m) (m) (m) (rad) (rad)
(rad)
cod 4.29E-03 4.85E-03 2.23E-03 4.15E-10 9.99E-07 1.41E-07
2.32E-07
emr 1.01E-03 2.32E-03 -2.17E-03 1.15E-09 -8.45E-07 -1.19E-07
-1.19E-08
esa -4.58E-03 -2.53E-03 9.24E-03 -9.26E-10 -8.47E-07 -1.18E-07
-1.20E-08
gfz -9.08E-04 -3.10E-03 4.47E-03 -5.22E-10 9.92E-07 1.33E-07
-5.96E-09
jpl -5.11E-03 -1.89E-03 -1.07E-02 -2.05E-09 -8.46E-07 -1.19E-07
-1.14E-08
mit 2.80E-03 -3.14E-05 7.83E-03 6.47E-10 -8.47E-07 -1.18E-07
-1.20E-08
ngs -4.82E-03 -3.59E-03 -1.21E-02 1.13E-09 -8.47E-07 -1.19E-07
-1.19E-08
------------------------------------------------------------------------
--------
7) 7 parameters from deconstrained A-Sinexes and GNET to CORE
Tx Ty Tz S Rx Ry
Rz
(m) (m) (m) (rad) (rad)
(rad)
cod 5.12E-03 1.08E-02 -6.88E-03 3.82E-09 1.85E-06 2.59E-07
2.44E-07
emr 4.42E-03 9.28E-03 -1.07E-02 4.70E-09 1.47E-09 -2.60E-10
7.33E-11
esa -2.68E-03 3.36E-03 4.29E-04 2.41E-09 2.55E-11 1.31E-10
1.31E-10
gfz 1.28E-04 2.81E-03 -4.45E-03 2.72E-09 1.84E-06 2.51E-07
6.15E-09
jpl -1.79E-03 7.10E-03 -1.60E-02 1.83E-09 8.05E-10 -1.87E-10
5.77E-10
mit 4.07E-03 7.54E-03 -1.58E-03 3.96E-09 1.02E-11 7.17E-12
1.48E-10
ngs -3.60E-03 2.98E-03 -2.11E-02 4.28E-09 2.10E-10 -1.89E-10
2.99E-11
GNET 9.26E-04 5.97E-03 -8.82E-03 3.26E-09 8.47E-07 1.19E-07
1.21E-08
------------------------------------------------------------------------
--------
8)Station sets, Residuals and Discrepancies with IGS station catalogue
igs.snx
Each station in this week's A-Sinexes is listed below.
For each AC estimating each station, a six-character report is given.
The meaning of each character and its possible states are as follows:
Char 1: INCLUSION in G-Sinex : i = included, X = excluded
Char 2: DOMES code info : - = given
d = not given and not known by IGS
N = not given but listed in IGS
catalogue
Char 3: ANTENNA information : - = matches IGS catalogue
a = text string discrep. (type and/or
S/N)
A = vector discrep. (phase centre) >
1mm
N = data not given
Char 4: RECEIVER information : - = matches IGS catalogue or not given
r = text string discrep. (type, S/N or
firm)
N = data not given
Char 5: ECCENTRICITY info - = matches IGS catalogue or not given
E = vector discrepancy > 1mm
N = data not given
Char 6: RESIDUAL size - = estimate not used
integer n = post-fit residual vector length <=
n SD
Important Note! The igs.snx catalogue is downloaded from the IGS CB.
Discrepancies in this section are discrepancies with the igs.snx file.
The codes are chosen so that:
A '-' means no problem.
A lower-case letter represents a less important discrepancy.
A upper-case letter represents an important discrepancy.
ACs with upper case codes - please modify your Sinex blocks.
SITE PT DOMES____ _cod__ _emr__ _esa__ _gfz__ _jpl__ _mit__ _ngs__
#035 A XPYPL#035 i-NNN- i-NNN- i-NNN- i-NNN-
#036 A XPYPL#036 i-NNN- i-NNN- i-NNN- i-NNN- i-NNN- i-NNN- i-NNN-
#037 A XPYPL#037 i-NNN- i-NNN- i-NNN- i-NNN- i-NNN- i-NNN- i-NNN-
#038 A XPYPL#038 i-NNN- i-NNN- i-NNN- i-NNN- i-NNN- i-NNN- i-NNN-
#039 A XPYPL#039 i-NNN- i-NNN- i-NNN- i-NNN- i-NNN- i-NNN- i-NNN-
#040 A XPYPL#040 i-NNN- i-NNN- i-NNN- i-NNN- i-NNN- i-NNN- i-NNN-
#041 A XPYPL#041 i-NNN- i-NNN- i-NNN- i-NNN- i-NNN- i-NNN- i-NNN-
#042 A XPYPL#042 i-NNN- i-NNN- i-NNN- i-NNN- i-NNN- i-NNN- i-NNN-
#043 A XPYPL#043 i-NNN- i-NNN- i-NNN- i-NNN-
albh A 40129M003 i-a--1 i-ar-1 i--r-1 i-a--1
algo A 40104M002 i----3 i-a--1 i-a--2 i----1 i----1 i----1 i----1
alic A 50137M001 i-a--1 i-ar-2 i-ar-1 i----1 i-a--1
alrt A 40162M001 i-a--1 i----1 i----1 i----1 i-A--2
amc2 A 40472S004 i-a--1 i--r-2 i--r-3 i----1 i-a--2
areq A 42202M005 i-a--1 i-ar-1 i--r-1 i--r-1 i----1 i-a--1
artu A 12362M001 i----1 i----2 i-a--2 i----2 i----1 i----1 i----1
asc1 A 30602M001 i----2 i-a--1 i----1 i----1 i----1 i----1
aspa A 50503S006 i-a--1 i----2 i----3 i----1 i-A--2
auck A 50209M001 i-a--2 i-ar-1 i-Ar-4 i----1 i-a--1
bahr A 24901M002 i----2 i----2 i----2 i----1 i----1 i----1
bako A 23101M002 i-a--3 i-ar-1 i----1 i-A--1
barh A 49927S001 X-----
bili A 12363M001 i----3 i----1 i----1 i----1 i----1
bjfs A 21601M001 i----2 i----1 i----1 i----2 i----2
bogt A 41901M001 i-a--2 i-ar-1 i-ar-1 i----1 i-A--2
bor1 A 12205M002 i----1 i----1 i----1
braz A 41606M001 i----1 i----1 i----1
brew A 40473M001 X-A---
brft A 41602M002 i-a--1 i----1 i-A--1
brmu A 42501S004 i-a--1 i-ar-1 i-ar-1 i-A--2
brus A 13101M004 i-a--2 i-ar-1 i----1 i-A--1
bucu A 11401M001 X-----
cagl A 12725M003 X-ar--
cagz A 12725M004 i-a--2 i----5 i-A--1
cas1 A 66011M001 i----1 i-ar-1 i-ar-2 i--r-2 i--r-1 i----1 i----1
cedu A 50138M001 i----2 i-ar-1 i--r-1 i--r-1 i----1 i----1
chat A 50207M001 i-a--2 i-ar-1 i-ar-1 i-ar-1 i-ar-1 i----1 i-A--1
chpi A 41609M003 i-a--2 i----2 i-A--1
chum A 25601M001 X----- X-a---
chur A 40128M002 i-a--1 i-a--1 i----1 i-a--1
coco A 50127M001 i-a--2 i-ar-1 i-ar-1 i-ar-2 i-ar-1 i----1 i-a--1
conz A 41719M002 i-a--2 i----2 i----1 i----1
cord A 41511M001 i-a--1 i-ar-1 i----1 i-A--1
crao A 12337M002 X-----
cro1 A 43201M001 i-a--1 i-ar-1 i-ar-1 i-ar-1 i----1 i-A--1
daej A 23902M002 i----1 i--r-1 i--r-1 i----1 i----1
darr A 50134M001 i-a--1 i-a--1 i--r-1
darw A 50134M001 i-ar-1 i-ar-1 i-ar-1 i----1 i-a--1
dav1 A 66010M001 i----2 i-ar-1 i--r-2 i----1 i----1
dgar A 30802M001 i-a--1 i-ar-1 i-ar-2 i-ar-1 i----1 i-A--3
drag A 20710S001 X-----
drao A 40105M002 i-a--2 i-ar-1 i-ar-2 i--r-1 i--r-1 i-a--1
dubo A 40137M001 i----1 i--r-1 i--r-1 i----1
dwh1 A 49837S001 i-a--2 i----1 i----2 i----1
eprt A 49928S001 X-ar--
fair A 40408M001 i-a--1 i-ar-1 i-ar-1 i-ar-1 i----1
flin A 40135M001 i----1 i--r-1 i----1
fort A 41602M001 i-a--1 i-a--1 i-a--1 i-a--1 i-a--1
geno A 12712M002 X----- X-----
glps A 42005M002 i-a--1 i----1 i----1 i----1 i----1 i-A--1 i-A--1
glsv A 12356M001 i----2 i----1 i----1
gmas A 31303S004 X----- X-----
gmsd A 21749S002 X-----
gode A 40451M123 i-ar-2 i--r-1 i----1 i-a--1
godz A 40451M123 X-----
gold A 40405S031 i----1 i-ar-1 i--r-1
gope A 11502M002 X-a--- X-ar--
goug A 30608M001 X----- X-----
gras A 10002M006 i-a--1 i-ar-1 i-A--1
graz A 11001M002 i-a--1 i-ar-2 i----1 i-a--1
guam A 50501M002 i----2 i-ar-2 i--r-2 i--r-1 i----1 i----2
guao A 21612M003 X----- X-A---
guat A 40901S001 i----1 i----1 i-A--1
guug A 82301M001 i----2 i----1 i-A--3
harb A 30302M009 i-a--2 i-ar-2 i----1 i-a--1
harv A 40420M101 X--r-- X--r--
hers A 13212M007 X-----
hert A 13212M010 X-a---
hflk A 11006S003 X-a---
hilo A 49979S001 i----1 i----1 i----2
hlfx A 40120M001 XN-r--
hnlc A 49970S001 i----2 i----1 i----1 i----1
hnpt A 49913S001 X-ar--
hob2 A 50116M004 i----1 i-ar-1 i--r-1 i--r-1 i----1 i----1
hofn A 10204M002 i-a--1 i-a--2 i-a--1 i-a--1
holb A 40130M001 X-ar--
holm A 40148M001 X-a--- X-----
hrao A 30302M004 i-a--1 i-ar-1 i-ar-1 i-ar-1 i----1 i-A--1
hyde A 22307M001 i-a--3 i-ar-2 i-ar-1 i-A--1 i-A--1
ieng A 12724S001 XN----
iisc A 22306M002 i----1 i-ar-1 i--r-1 i--r-1 i----1
invk A 40150M001 i-a--1 i----1 i-A--1
irkj A 12313M002 X-a---
irkt A 12313M001 i----1 i-a--2 i----1 i----1 i----1 i----1
ispa A 41703M007 i-a--2 i----2 i-a--2 i----1 i----1 i-A--1
jab1 A 50136M001 i-a--1 i-a--1 i-a--1 i----1 i-A--2
joz2 A 12204M002 X-a---
joze A 12204M001 i----1 i----1 i----1
jplm A 40400M007 X--r-- X-----
karr A 50139M001 i----2 i-ar-1 i--r-1 i--r-1 i----1 i----2
kely A 43005M001 i-a--1 i-ar-2 i-ar-1 i-A--1
kerg A 91201M002 i----1 i-ar-2 i-ar-1 i--r-1 i--r-1 i----1 i----2
kgn0 A 21704S006 X--r-- X--r--
khaj A 12361M001 i-a--3 i----2 i----1 i-A--1
kir0 A 10422M001 X----- X--r--
kiru A 10403M002 i-ar-1 i-ar-1 i-ar-1 i-A--1
kit3 A 12334M001 i----1 i-a--1 i----1 i----1 i----1 i----1
kokb A 40424M004 i-a--2 i-ar-2 i-ar-2 i-ar-1 i----1 i-A--2
kosg A 13504M003 X----- X--r--
kou1 A 97301M211 X-a---
kour A 97301M210 i-ar-2 i-ar-1 i-ar-1 i-ar-1 i----1 i-A--1
kunm A 21609M001 i----1 i----1 i----1 i----1
lae1 A 51002M001 i----1 i----1 i----2
lama A 12209M001 X-a--- X-A---
lhas A 21613M001 i-ar-1 i--r-1 i--r-1 i----1 i----1
lhaz A 21613M002 X----- X--r--
lpgs A 41510M001 i-a--1 i-ar-1 i-ar-1 i--r-1 i--r-1 i--r-1 i-a--1
lroc A 10023M001 X----- X-----
mac1 A 50135M001 i----1 i-ar-1 i--r-1 i--r-1 i----1
mad2 A 13407S012 X--N-- X-----
madr A 13407S012 X-ar-- X-a---
mag0 A 12354M001 i----2 i----1 i----1
mali A 33201M001 i----1 i-ar-1 i--r-1 i----1 i----1
mana A 41201S001 i-a--1 i----1 i-A--1
manz A 40513S001 X-----
mas1 A 31303M002 i----1 i-ar-2 i-ar-1 i--r-1 i--r-1 i----1 i----1
mat1 A 12734M009 X-a--- X-----
mate A 12734M008 i-ar-1 i--r-1 i----1 i----1
maui A 40445S008 i----2 i----1 i----2
maw1 A 66004M001 i----2 i-ar-1 i--r-1 i----1 i----1
mbar A 33901M001 i-a--2 i----1 i----2 i----2
mcm4 A 66001M003 i--r-2 i-ar-1 i--r-2 i--r-1 i----1 i----1
mdo1 A 40442M012 i----2 i----1 i----1 i----1
mdvj A 12309M005 i-a--3 X----- i----1
medi A 12711M003 X-a--- X-----
mets A 10503S011 i--r-1 i----1 i----1
metz A 10503M005 X-----
mizu A 21702M002 i-a--1 i----1 i----1
mkea A 40477M001 i----3 i-ar-1 i--r-1 i----1 i----2
mobn A 12365M001 X-----
monp A 40497M004 X-a---
morp A 13299S001 X-----
msku A 32810M001 i-a--2 i----2 i----1 i----1 i-A--1
mtka A 21741S002 X-----
nain A 40164M001 X----- X-----
nano A 40138M001 X-ar--
nico A 14302M001 i----2 i--r-2 i--r-1 i----1
nisu A 49507M001 X-a--- X-----
nklg A 32809M002 i-a--1 i----2 i----1 i----1 i-a--1
nlib A 40465M001 i----1 i--r-1 i----1 i----1
nnor A 50181M001 X-a--- X-----
not1 A 12717M004 i-a--2 i----2 i----1 i-a--1
noum A 92701M003 i-a--2 i-ar-1 i-Ar-2 i----1 i-a--2
novj A 12367M001 X-a--- X-A---
npld A 13234M003 X-a--- X-----
nrc1 A 40114M001 i-a--1 i-ar-1 i-ar-1 i--r-1 i----1 i-a--1
nril A 12364M001 i-a--1 i----1 i----1 i-A--1 i-A--1
ntus A 22601M001 i----1 i-ar-2 i--r-2 i--r-1 i----1 i----2
nvsk A 12319M001 X-----
nya1 A 10317M003 i----1 i----1 i----2 i----1
nyal A 10317M001 i-a--2 i----2 i----1 i----1
obe2 A 14208M003 X-----
ohi2 A 66008M005 i-a--1 i-a--1 i----1 i----1 i----1 i-a--1
ohi3 A 66008M006 X-a---
onsa A 10402M004 i----2 i-ar-2 i--r-1 i--r-2 i----1 i----1
opmt A 10001S006 i-a--1 i----3 i----9
ous2 A 50212M002 i----2 i----1 i-a--2
pado A 12750S001 X-a---
pdel A 31906M004 i-a--1 i-a--1 i----1 i----1 i-A--1
pert A 50133M001 i-a--1 i-ar-1 i-ar-1 i-ar-1 i-ar-1 i----1 i-A--1
petp A 12355M002 i-a--2 i----1 i-a--1
pets A 12355M003 i----2 i----1 i----5
pie1 A 40456M001 i----1 i-ar-2 i--r-1 i----1 i----1
pimo A 22003M001 i-a--1 i-ar-1 i-ar-1 i-ar-1 i----1 i-A--3
pol2 A 12348M001 i-a--3 i-ar-3 i-ar-1 i----1 i-A--1
polv A 12336M001 X-----
pots A 14106M003 i----2 i-ar-2 i--r-2 i----1
prds A 40124M001 X----- X-----
ptbb A 14234M001 X-a--- X-----
qaq1 A 43007M001 i-A--1 i----1 i----5 i----1 i----1
qiki A 40166M001 X----- X-----
quin A 40433M004 X-----
rabt A 35001M002 i-a--1 i----1 i----1 i-A--1
ramo A 20703S001 i-a--2 i-a--1 i-a--1 i-A--1
rbay A 30315M001 i-a--1 i-a--1 i-a--1 i----1 i----1 i----1 i-a--1
reun A 97401M003 i-a--1 i----1 i-A--1
reyk A 10202M001 i--r-2 i--r-2 i-a--1
reyz A 10202M003 i----1 i--r-1 i--r-2
riog A 41507M004 i----1 i----1 i-a--2 i----2 i----1 i----1 i----1
sant A 41705M003 i----1 i-ar-1 i--r-1 i--r-1 i----1 i----2
scor A 43006M002 X-----
scub A 40701M001 i-a--1 i-ar-1 i-Ar-2 i-A--1 i-A--1
sele A 12352M001 X----- X-----
sfer A 13402M004 i-a--2 i--r-1 i-Ar-1 i----1 i-a--1
shao A 21605M002 i----1 i-a--1 i----1 i----1 i----1 i----1
sio3 A 40460M004 X-ar-- X-a---
sofi A 11101M002 X----- X--r--
sol1 A 49907S001 X--r--
spt0 A 10425M001 X-----
ssia A 41401S001 i-a--1 i----1 i----1 i-A--1
stjo A 40101M001 i-a--1 i-ar-1 i-ar-1 i-ar-1 i-Ar-1 i--r-1 i-a--1
str1 A 50119M002 X-----
str2 A 50119M001 X-ar--
sunm A 50143M001 X-A---
suth A 30314M002 i-a--1 i-ar-1 i-ar-2 i----1 i-A--2
sutm A 30314M004 i----2 i----1 i--r-1
suwn A 23903M001 i-a--1 i-ar-1 i-ar-1 i-a--2
syog A 66006S002 i----1 i--r-1 i-ar-1 i--r-1 i--r-1 i----1 i----1
tehn A 20404M002 X-ar--
thti A 92201M009 i-a--3 i-ar-1 i-ar-2 i-ar-1 i-ar-1 i----1 i-A--3
thu2 A 43001M002 X-a---
thu3 A 43001M002 i----1 i-a--1 i----1 i----1 i----1 i-A--1
tid1 A 50103M108 X--r-- X-----
tid2 A 50103M108 X----- X-----
tidb A 50103M108 i-Ar-2 i-ar-1 i-ar-1 i----1 i-a--1
tixi A 12360M001 i-a--2 i-a--2 i-ar-2 i-a--1 i-a--1 i----1 i-a--1
tlse A 10003M009 i-a--1 i----1 i----1
tow2 A 50140M001 i----1 i-ar-1 i--r-2 i--r-1 i----1 i----3
trab A 20808M001 i----1 i----1 i----1 i----1
tro1 A 10302M006 i-a--1 i-a--2 i----1 i-a--1
tskb A 21730S005 i-a--1 i-ar-2 i-ar-2 i-ar-1 i-ar-1 i--r-1 i-a--2
tubi A 20806M001 X--r--
twtf A 23603S002 i-a--2 i----1 i----1 i-A--3
ulab A 24201M001 i-a--1 i----2 i----1 i-a--1
unb1 A 40146S001 X-a---
unsa A 41514M001 i-a--2 i-ar-1 i-ar-2 i-ar-1 i----1 i-a--1
usn3 A 40451S007 X-----
usno A 40451S003 i----2 i-ar-2 i----1
usud A 21729S007 i----2 i-ar-2 i--r-2 i--r-1 i----1 i----1
uzhl A 12301M001 X----- X-----
vene A 12741M001 X-ar--
vill A 13406M001 i-a--1 i-ar-2 i-ar-1 i--r-1 i----1 i-a--1
wes2 A 40440S020 i-a--1 i-a--2 i-a--1 i-a--1
whit A 40136M001 i----1 i--r-2 i--r-1 i----1 i----1
will A 40134M001 i----2 i--r-1 i--r-1
wroc A 12217M001 X--r--
wsrt A 13506M005 i----1 i--r-1 i----1 i----1
wtzr A 14201M010 i-a--2 i--r-1 i----1 i-ar-2
wtzz A 14201M014 X-a---
wuhn A 21602M001 i-a--1 i-ar-1 i-ar-2 i----1 i-A--2
yakt A 12353M002 i-a--1 i----1 i----1 i----1 i-A--2
yar2 A 50107M004 i-ar-1 i-Ar-1 i----1 i-a--2
yarr A 50107M006 X----- X-----
yebe A 13420M001 X-----
yell A 40127M003 i----1 i-a--2 i-a--2 i----1 i----1 i----1 i----1
yssk A 12329M003 i----2 i----1 i----1 i----1 i----2
zimj A 14001M006 X-----
zimm A 14001M004 i----1 i--r-1 i--r-1 i----1
zwe2 A 12330M003 X-a--- X-----
------------------------------------------------------------------------
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