SIMPLE = T / file does conform to FITS standard BITPIX = 16 / number of bits per data pixel NAXIS = 0 / number of data axes EXTEND = T / FITS dataset may contain extensions COMMENT FITS (Flexible Image Transport System) format is defined in 'AstronomyCOMMENT and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H HDUNAME = 'PRIMARY ' / ASCDM block name LONGSTRN= 'OGIP 1.0' / The HEASARC Long String Convention may be used.COMMENT This FITS file may contain long string keyword values that are COMMENT continued over multiple keywords. The HEASARC convention uses the & COMMENT character at the end of each substring which is then continued COMMENT on the next keyword which has the name CONTINUE. ORIGIN = 'ASC ' / Source of FITS file CREATOR = 'mkarf v0.6.2-0' / Program creating this file MJD_OBS = 5.5789828851682E+04 / Modified Julian date of observation DS_IDENT= 'ADS/Sa.CXO#obs/12182' / dataset identifier CHECKSUM= 'Mn7SMl5SMl5SMl5S' / HDU checksum updated 2013-05-02T20:08:11 DATASUM = ' ' / data unit checksum updated 2013-05-02T20:08:05 DATE = '2013-05-02T20:08:11' / Date and time of file creation DATE-OBS= '2011-08-16T19:53:32' / Observation start date DATE-END= '2011-08-17T12:55:08' / Observation end date TIMESYS = 'TT ' / Time system MJDREF = 5.0814000000000E+04 / [d] MJD zero point for times TIMEZERO= 0.0000000000000E+00 / [s] Clock correction TIMEUNIT= 's ' / Time unit CLOCKAPP= T / default DETNAM = 'ACIS-2 ' / ACIS-I2 FILTER = ' ' GRATING = 'NONE ' CYCLE = 'P ' / events from which exps? Prim/Second/Both SIM_X = -7.8090834371673E-01 / [mm] SIM offset SIM_Y = 0.0000000000000E+00 / [mm] SIM offset SIM_Z = -2.2584585764733E+02 / [mm] SIM offset TSTART = 4.2991161278529E+08 / [s] Observation start time (MET) TSTOP = 4.2997290881350E+08 / [s] Observation end time (MET) MISSION = 'AXAF ' / Mission TELESCOP= 'CHANDRA ' / Telescope Used INSTRUME= 'ACIS ' / Instrument OBS_ID = '12182 ' / Observation id OBI_NUM = 0 / Obi number SEQ_NUM = '800948 ' / Sequence number END XTENSION= 'BINTABLE' / binary table extension BITPIX = 8 / 8-bit bytes NAXIS = 2 / 2-dimensional binary table NAXIS1 = 12 / width of table in bytes NAXIS2 = 1070 / number of rows in table PCOUNT = 0 / size of special data area GCOUNT = 1 / one data group (required keyword) TFIELDS = 3 / number of fields in each row EXTNAME = 'SPECRESP' / Imaging ARF HDUNAME = 'SPECRESP' / ASCDM block name CONTENT = 'SPECRESP' HDUVERS = '1.1.0 ' HDUCLASS= 'OGIP ' HDUCLAS1= 'RESPONSE' HDUCLAS2= 'SPECRESP' HDUVERS1= '1.0.0 ' / Obsolete Keyword HDUVERS2= '1.1.0 ' / Obsolete Keyword ARFVERSN= '1992a ' / Obsolete Keyword TTYPE1 = 'ENERG_LO' / Energy TFORM1 = '1E ' / format of field TUNIT1 = 'keV ' TLMIN1 = 0.0000000E+00 TLMAX1 = 2.0000000E+01 TTYPE2 = 'ENERG_HI' / Effective Area TFORM2 = '1E ' / format of field TUNIT2 = 'keV ' TLMIN2 = 0.0000000E+00 TLMAX2 = 2.0000000E+01 TTYPE3 = 'SPECRESP' / Effective Area TFORM3 = '1E ' / format of field TUNIT3 = 'cm**2 ' LONGSTRN= 'OGIP 1.0' / The HEASARC Long String Convention may be used.COMMENT This FITS file may contain long string keyword values that are COMMENT continued over multiple keywords. The HEASARC convention uses the & COMMENT character at the end of each substring which is then continued COMMENT on the next keyword which has the name CONTINUE. ORIGIN = 'ASC ' / Source of FITS file CREATOR = 'mkarf v0.6.2-0' / Program creating this file ASCDSVER= 'CIAO 4.3' / ASCDS version number MJD_OBS = 5.5789828851682E+04 / Modified Julian date of observation DS_IDENT= 'ADS/Sa.CXO#obs/12182' / dataset identifier REVISION= 2 / Processing version of data CHECKSUM= '0VNS0VKR0VKR0VKR' / HDU checksum updated 2013-05-02T20:08:11 DATASUM = '1343396052' / data unit checksum updated 2013-05-02T20:08:11 RAND_SKY= 0.0000000000000E+00 RAND_PI = 0.0000000000000E+00 DATE = '2013-05-02T20:08:11' / Date and time of file creation DATE-OBS= '2011-08-16T19:53:32' / Observation start date OBS_MODE= 'POINTING' / Observation mode DATE-END= '2011-08-17T12:55:08' / Observation end date TIMESYS = 'TT ' / Time system MJDREF = 5.0814000000000E+04 / [d] MJD zero point for times TIMEZERO= 0.0000000000000E+00 / [s] Clock correction TIMEUNIT= 's ' / Time unit BTIMNULL= 4.2662688531295E+08 / Basic Time offset (s) DATACLAS= 'OBSERVED' / default RADESYS = 'ICRS ' / default BTIMRATE= 2.5625001345783E-01 / Basic Time clock rate (s / VCDUcount) BTIMDRFT= -2.0358178290528E-18 / Basic Time clock drift (s / VCDUcount^2) FILTER = 'NONE ' / QE includes all filters RESPFILE= '0.3:11.0:0.01' / RMF File ASPFILE = '../../acisf12182/products/aux/asphist_2.fits.gz' / Aspect Histogram FBTIMCORR= 0.0000000000000E+00 / Correction applied to Basic Time rate (s) TIMEREF = 'LOCAL ' / Time reference (barycenter/local) TASSIGN = 'SATELLITE' / Time assigned by clock CLOCKAPP= T / default SIM_X = -7.8090834371673E-01 / [mm] SIM offset SIM_Y = 0.0000000000000E+00 / [mm] SIM offset SIM_Z = -2.2584585764733E+02 / [mm] SIM offset FOC_LEN = 1.0070000000000E+04 / [mm] HRMA focal length TIERRELA= 1.0000000000000E-09 / default TIERABSO= 5.0000000000000E-05 / default TIMVERSN= 'ASC-FITS-2' / Timing system definition TSTART = 4.2991161278529E+08 / [s] Observation start time (MET) GRATING = 'NONE ' / Grating DETNAM = 'ACIS-2 ' / ACIS-I2 RA_PNT = 3.0863189666732E+02 / [deg] Pointing RA DEC_PNT = -5.9623091320685E+01 / [deg] Pointing Dec ROLL_PNT= 3.3741243847974E+02 / [deg] Pointing Roll RA_TARG = 3.0853416700000E+02 / [deg] Observer's specified target RA DEC_TARG= -5.9600389000000E+01 / [deg] Observer's specified target Dec DEFOCUS = 1.4398718632593E-03 / [mm] SIM defocus RA_NOM = 3.0863189666732E+02 / [deg] Nominal RA DEC_NOM = -5.9623091320685E+01 / [deg] Nominal Dec ROLL_NOM= 3.3741243847974E+02 / [deg] Nominal Roll TSTOP = 4.2997290881350E+08 / [s] Observation end time (MET) STARTMJF= 100182 / Major frame ctr value at start of data STARTMNF= 66 / Start minor frame ctr at start of data STARTOBT= 0.0000000000000E+00 / On-Board MET close to STARTMJF and STARTMNF STOPMJF = 102005 / Major frame ctr value at stop of data STOPMNF = 116 / Stop minor frame ctr at end of data TIMEPIXR= 5.0000000000000E-01 / default TIMEDEL = 3.1410400000000E+00 / [s] timedel Lev1 CTI_CORR= T CTI_APP = 'PPPPPBPBPP' MISSION = 'AXAF ' / Mission TELESCOP= 'CHANDRA ' / Telescope Used INSTRUME= 'ACIS ' / Instrument READMODE= 'TIMED ' / Read mode FRACEXPO= 9.6685609562914E-01 / Effective fractional exposure DATAMODE= 'VFAINT ' / Data mode FLSHTIME= 0.0000000000000E+00 / [s] CYCLE = 'P ' / events from which exps? Prim/Second/Both TITLE = 'Chandra Observations of a Sample of High Redshift SZE Selected Gala&'CONTINUE 'xy Clusters' / Proposal title OBSERVER= 'Dr Stephen Murray' / Principal investigator OBJECT = 'SPT-CL 2034-5936' / Source name OBS_ID = '12182 ' / Observation id OBI_NUM = 0 / Obi number SEQ_NUM = '800948 ' / Sequence number ONTIME = 5.9674589557230E+04 / [s] Sum of GTIs ONTIME2 = 5.9674589557230E+04 / [s] Sum of GTIs LIVETIME= 5.8894897112872E+04 / [s] Livetime LIVTIME2= 5.8894897112872E+04 / [s] Livetime EXPOSURE= 5.8895169253021E+04 / [secs] Total exposure time EXPOSUR2= 5.8894897112872E+04 / [s] Exposure time DTCOR = 9.8693426381071E-01 / Dead time correction ASPTYPE = 'KALMAN ' FP_TEMP = 1.5360722351000E+02 / [K] Focal Plane Temperature HISTORY ----------------------------------------------------------------- HISTORY MKARF Processing History HISTORY ----------------------------------------------------------------- HISTORY Startup Directory: /xassist/data/pipeline4/chandra/12182/acisf12182/prodHISTORY ucts HISTORY Cmd Line: mkarf @@/tmp/tmpd_vBZT.par mode=hl HISTORY Parameter file used: /tmp/tmpd_vBZT.par HISTORY Detector Mask File: ../../acisf12182/data/aux/acisf12182_000N002_msk1.fiHISTORY ts.gz HISTORY Source SKY position: (3727.78,3964.2) HISTORY ---------------------------------------------------------------------- HISTORY ARDLIB History Records HISTORY ---------------------------------------------------------------------- HISTORY ARDLIB Version: 0.8.5 HISTORY File used for CALDB info: ../../acisf12182/products/events/fullrun_ccd2_HISTORY acisf12182_pi14-548_pass1_cl_src5_src.evt.gz HISTORY Parameter file: /opt/ciao-4.3/param/ardlib.par HISTORY ACIS QE File: /opt/ciao-4.3/CALDB/data/chandra/acis/qe/acisD1997-04-17qeHISTORY N0006.fits[3] HISTORY ACIS Uniformity File: /opt/ciao-4.3/CALDB/data/chandra/acis/qeu/acisD200HISTORY 0-01-29qeuN0006.fits[3] HISTORY ACIS Contamination File: /opt/ciao-4.3/CALDB/data/chandra/acis/contam/acHISTORY isD1999-08-13contamN0006.fits[3] HISTORY ACIS 2 Badpix File: /opt/ciao-4.3/CALDB/data/chandra/acis/badpix/acisD20HISTORY 00-11-28badpixN0003.fits[3] HISTORY Vignetting File: /opt/ciao-4.3/CALDB/data/chandra/default/vignet/hrmaD19HISTORY 96-12-20vignetN0003.fits[1] HISTNUM = 22 HISTORY Onaxis Area File: /opt/ciao-4.3/CALDB/data/chandra/default/axeffa/hrmaD1HISTORY 996-12-20axeffaN0008.fits[1] HISTORY ---------------------------------------------------------------------- HISTORY ---------------------------------------------------------------------- HISTORY PIXLIB History Records HISTORY ---------------------------------------------------------------------- HISTORY PIXLIB Version: 4.0.0 HISTORY ****** PIXLIB Parameter File ***** HISTORY /opt/ciao-4.3/param/geom.par: HISTORY instruments = /opt/ciao-4.3/CALDB/data/chandra/default/geom/telD1999-07HISTORY -23geomN0006.fits(CALDB) HISTORY aimpoints = /opt/ciao-4.3/CALDB/data/chandra/default/aimpts/telD1999-HISTORY 07-23aimptsN0002.fits(CALDB) HISTORY tdet = /opt/ciao-4.3/CALDB/data/chandra/default/tdet/telD1999-07HISTORY -23tdetN0001.fits(CALDB) HISTORY sky = /opt/ciao-4.3/CALDB/data/chandra/default/sky/telD1999-07-HISTORY 23skyN0002.fits(CALDB) HISTORY shell = /opt/ciao-4.3/CALDB/data/chandra/default/sgeom/telD1999-0HISTORY 7-23sgeomN0001.fits(CALDB) HISTORY obsfile = nowT00:00:00() HISTORY ****** PIXLIB System Configuration ****** HISTORY Telescope = AXAF HISTORY Focal Length (mm) = 10070.000 HISTORY Detector = ACIS HISTORY Focal Plane Sys. = FP-1.1 HISTORY Tiled Detector Plane Sys. = ACIS-2.2 HISTORY SIM Offset (mm) = (0.684 0.75 236.552) HISTORY Aim Point(NONE) (mm) = (-0.780908 0 -225.846) HISTORY Grating Arm = HEG HISTORY Grating Order = 1 HISTORY Dispersion Plane Sys. = ASC-GDP-1.1 HISTORY Rowland Circle (mm) = 8632.48 HISTORY ---------------------------------------------------------------------- HISTORY TOOL :mkarf 2013-05-02T20:08:11 ASC00001HISTORY PARM :asphistfile=../../acisf12182/products/aux/asphist_2.fitsASC00002HISTORY CONT :.gz ASC00003HISTORY PARM :outfile=../../acisf12182/products/spectra/fullrun_ccd2_aASC00004HISTORY CONT :cisf12182_pi14-548_pass1_cl_src5.arf ASC00005HISTORY PARM :sourcepixelx=3727.7797672 ASC00006HISTORY PARM :sourcepixely=3964.2045986 ASC00007HISTORY PARM :engrid=0.3:11.0:0.01 ASC00008HISTORY PARM :obsfile=../../acisf12182/products/events/fullrun_ccd2_acASC00009HISTORY CONT :isf12182_pi14-548_pass1_cl_src5_src.evt.gz ASC00010HISTORY PARM :pbkfile=../../acisf12182/data/aux/acisf429912972N002_pbkASC00011HISTORY CONT :0.fits.gz ASC00012HISTORY PARM :dafile=CALDB ASC00013HISTORY PARM :mirror=HRMA ASC00014HISTORY PARM :detsubsys=ACIS-I2 ASC00015HISTORY PARM :grating=NONE ASC00016HISTORY PARM :maskfile=../../acisf12182/data/aux/acisf12182_000N002_msASC00017HISTORY CONT :k1.fits.gz ASC00018HISTORY PARM :ardlibparfile=ardlib.par ASC00019HISTORY PARM :geompar=geom ASC00020HISTORY PARM :verbose=0 ASC00021HISTORY PARM :clobber=yes ASC00022END >>RR> =&> >>D>>{>"]>{>33>>33>Q?#k>Q>p?_>p>\?.p>\>Ǯ?l0>Ǯ>@>>@ 5>> =@G> =>(@ĵ>(>G@>G>ff@>ff>A S+>>A+>>AN2>>HAu>H?A]??\A?\?AɃ"??A%?? =qA? =q? A!?p?޸RC-?޸R?C&??GCHY?G?\D\ ?\? Dc? ?Da??ffDx?ff?Dv??D??=qDS?=q?Du??C]}??{CnG?{?\)C:?\)?CE??C??33C?33?zC?z?C9C?? =CL? =?QC?Q?C??HC?H?(C?(?pC>?p?RCw?R@CA@@C"{@@GCӄ@G@C;@@\C@\@33CI@33@ Cc@ @zC6@z@Cu@@Cb3@@ffCi)@ff@ =CmdZ@ =@Cm@@QCdH@Q@C[@@ CT@ @ =qCI@ =q@ HCNk@ H@ CWu@ @ (CY @ (@ C_ @ @ pCcΘ@ p@{Ck@{@RCp2@R@\)Cti@\)@Cv3@@CuH@@GCxI@G@C~@@\C#@\@33Ck@33@ CB@ @zC@z@CU@@C}@@ffC@ff@ =C+@ =@C&@@QC4(@Q@Ck@@C\@@=qC q@=q@HCO@H@C0@@(Cu*@(@C%@@pCڙ@p@{C@{@RC@R@\)CP@\)@ C@ @ C@ @!GC@!G@!C"@!@"\CP@"\@#33C@#33@# C3@# @$zC@$z@%C@%@%C[@%@&ffC$@&ff@' =CH@' =@'C@'@(QC@(Q@(C@(@)C@)@*=qC,@*=q@*HC@*H@+CD@+@,(C@,(@,C@,@-pC@-p@.{C#@.{@.RC@.R@/\)Cv$@/\)@0C d@0@0C@0@1GCpY@1G@1C@1@2\CUh@2\@333C6@333@3 Cъ@3 @4zC@4z@5C@5@5C+@5@6ffC@6ff@7 =CG@7 =@7C@7@8QC~@8Q@8C@8@9C@9@:=qCr@:=q@:HC5t@:H@;Cs@;@<(C;@<(@{CQ@>{@>RCI@>R@?\)C/@?\)@@C:@@@@C*@@@AGC6@AG@AC@A@B\C@B\@C33C}X@C33@C C@C @DzC7@Dz@ECl@E@ECʕ@E@FffC!@Fff@G =C~@G =@GC@G@HQC2@HQ@HCY@H@ICR@I@J=qC@J=q@JHChJ@JH@KCG@K@L(Cl@L(@LCe@L@MpC'@Mp@N{C@N{@NRCC@NR@O\)C]@O\)@PCcj@P@PC9@P@QGCQ:@QG@QC_@Q@R\C.@R\@S33Cf@S33@S C#@S @TzC@Tz@UCE@U@UC&@U@VffC @Vff@W =CQ@W =@WC@W@XQC}r@XQ@XC@X@YC@Y@Z=qC8A@Z=q@ZHC_@ZH@[Cܐ@[@\(C @\(@\C@\@]pC;@]p@^{Cu:@^{@^RC@^R@_\)C@_\)@`C(@`@`Cc@`@aGC@aG@aCY@a@b\C@b\@c33C*0@c33@c CVB@c @dzC@dz@eC@e@eCӽ@e@fffC@fff@g =C@g =@gCNE@g@hQC@hQ@hCY@h@iC@i@j=qC@j=q@jHC@jH@kCK@k@l(CC~@l(@lCm@l@mpC@mp@n{C@n{@nRCV@nR@o\)Cϛ@o\)@pC@p@pC@p@qGC@qG@qCh@q@r\C@r\@s33C&@s33@s C2@s @tzC8Y@tz@uC=@u@uCZ:@u@vffCvY@vff@w =Cc@w =@wCR@w@xQC;@xQ@xC@x@yC@y@z=qC@z=q@zHC@zH@{C'@{@|(C@|(@|C@|@}pC @}p@~{C+@~{@~RCL@~R@\)Cgc@\)@C@@QC@Q@CB@@C@@GC@G@C @@C@@=qC@@=q@\C@\@HCX@H@33Cw@33@Cg|@@ CY@ @(CK@(@zC1@z@C@@C@@pC@p@CԴ@@{C@{@ffC@ff@RC@R@ =Cp@ =@\)CT@\)@C7@@@C@@QC@Q@C,@@C~@@GC@G@Cs@@CN@@=qC+@=q@\C@\@HC`@H@33C@33@C_@@ Ct@ @(C4@(@zC @z@C@@C^@@pCv-@p@C7@@{C@{@ffCk@ff@RC@R@ =C[@ =@\)Cn@\)@CV@@CA@@QCu@Q@C6B@@C@@GCk@G@C{@@C2@@=qC@=q@\C@\@HC9@H@33C@33@C@@ CJ@ @(C@(@zC@z@Cu@@C&@@pC@p@C_@@{C@{@ffC@ff@RCo@R@ =CM@ =@\)C@\)@CS@@C@@QC@Q@C7m@@C @@GCv@G@C<@@Cn@@=qC>@=q@\C@\@HCu @H@33C@33@C2@@ CCX@ @(Cϓ@(@zCmK@z@C @@C@@pC(@p@C@@{CDF@{@ffC~@ff@RC^@R@ =C@ =@\)Cj@\)@C@@Cho@@QC_@Q@C]@@C@@GCS@G@CT@@CI@@=qC@=q@\C:4@\@HC@H@33C @33@C@@ C4@ @(C@(@zC r@z@C;@@C@@pCe4@p@C@@{CH@{@ffC@ff@RC5@R@ =C@ =@\)Cw@\)@C@@C@@QCMA@Q@C@@C @@GC@G@C#@@CO@@=qC@=q@\C @\@HC@H@33C@33@CO@@ C?@ @(C@(@zCs@z@C̈@@C-"@@pCG@p@C@@{CjR@{@ffC5@ff@RC?@R@ =C@ =@\)C@\)@C}}@@C,@@QCQ@Q@C@@CX@@GC{@G@C@@C^@@=qC@=q@\C~Nv@\@HC}%R@H@33C{@33@Cz"@@ Cy@ @(Cx@(@zCwj@z@CvK@@Cu4@@pCt%U@p@Cs^@@{Cr@{@ffCp@ff@RCo@R@ =Cn@ =@\)Cm@\)@Cl;@@CkD@@QCj@Q@Ci@@Ch@@GCg1@G@Cf@@Ce@@=qCd@=q@\Cc@\@HCby@H@33Cag@33@C`\@@ C_W@ @(C^R@(@zC]LI@z@C\Fd@@C[\@@pCZ@p@CY@@{CX@{@ffCWl]@ff@RCVQ@R@ =CUF@ =@\)CT@{@ffC=Ӥ@ff@ƸRC<@ƸR@ =C; @ =@\)C:@\)@ǮC9٭@Ǯ@C8%@@QC7o@Q@ȣC6@ȣ@C5]@@GC4@G@əC3'@ə@C2h@@=qC1@=q@ʏ\C0@ʏ\@HC/O@H@33C.@33@˅C-x{@˅@ C,]%@ @(C+B@(@zC*5@z@C))@@C(*@@pC'8l@p@C&F@@{C%0/@{@ffC$l@ff@θRC# @θR@ =C! @ =@\)C @\)@ϮC@Ϯ@C@@QC@Q@УC@У@C%@@GC~@G@љC^@љ@CK~@@=qCC@=q@ҏ\C<@ҏ\@HC&1@H@33CM@33@ӅC=@Ӆ@ C@ @(C}@(@zC@z@C֫@@C β@@pC Ψ@p@C m@@{C @{@ffC @ff@ָRC@ָR@ =C+@ =@\)C@\)@׮C @׮@Ctp@@QCl@Q@أCm@أ@Con@@GCY@G@ٙBs@ٙ@BrI@@=qBs@=q@ڏ\Bw@ڏ\@HBX@H@33B@33@ۅB@ۅ@ B@ @(B2@(@zB쑍@z@Bꊷ@@Bh@@pB@p@B@@{B(@{@ffB @ff@޸RB3@޸R@ =B`@ =@\)Bۏ@\)@߮B;@߮@B@@QB0@Q@BEj@@B[@@GBВ@G@ᙚBg@ᙚ@B @@=qBQ@=q@\Bə@\@HB@H@33B@33@B_d@@ B¥y@ @(B@(@zB3@z@B{@@B@@pBZM@p@B@@{Be@{@ffBZ@ff@RB@R@ =B]@ =@\)B@\)@Ba*@@B=@@QBG@Q@B@@BU3@@GBw@G@陚B)L@陚@B-@@=qB+@=q@\B&@\@HB=@H@33BŊ@33@BJ@@ BX@ @(BO@(@zB9@z@B@@@B'@@pB@p@BD@@{B@{@ffBċ@ff@RBz@R@ =B&j@ =@\)B\@\)@Bz@@B#8@@QB@Q@BC@@B@@GBE{@G@B@@B@@=qB@=q@\B@\@HB{@H@33B|-x@33@By_@@ Bww@ @(BuFG@(@zBs@z@BpX@@Bn&@@pBls@p@Bj@@{Bhu@{@ffBfQ@ff@RBd:R@R@ =Bb/Y@ =@\)B`%_@\)@B^<@@B\T@@QBZe%@Q@BXn\@@BVx@@GBTon@G@BRgX@@BP@@=qBNӊ@=q@\BM@\@HBK^"@H@33BI@33@BGֺ@@ BF(@ @(BD:>@(@zBB_@z@BA@@B?/@@pB=@p@BA,A,?_}A,A-?YA-A-G?SMA-GA-p?MA-pA-?GTA-A-?B^(A-A-?