August 28, 1998
 
 This note documents an error in the FTOOLS 4.1 version of
 PCARMF  (and consequently PCARSP).
 
 PCARMF has 2 ways to read the energy-to-channel conversions:  from
 a fits file (usually, but not necessarily, supplied through the caldb);
 and from an ascii file which I generate.  The standard practice is that
 Jim Lochner turns the ascii file into a FITS file and arranges to have it
 installed in the caldb.
 
 I usually continue, however, to run the tool with "pcarmf .....
 nofits=1 e2cfile=ascii_file ...." while pcarsp calls "pcarmf ....
 e2cfile=$e2c ........" where $e2c = caldb unless otherwise
 specified on the command line.
 
 Both versions read the parameters correctly.
 
 And in both cases, pcarmf reads parameters from the .par file which
 describe the time rate of change of the energy 2 channel parameters
 (this is the time dependent gain that you hear me saying we have incorporated).
 
 The code error causes the time dependence to not be included if the
 energy to channel parameters are read from a FITS file.  This is the
 cause of the discrepancy noticed and first questioned by Julia Lee.  Matrices made
 with the current tools are therefore equivalent to my estimates of what the matrices
 were on 96 April 14.
 
 A corrected version of pcarmf (v3.5) has been delivered to the GOF for inclusion in
 the next release, currently anticipated in November 1998,


Here is what to do in the mean time:



   a)  use pset to set the value of pcarmf hidden parameter nofits=1

   b)  Take the file appended below, and call it, forinstance, PCA.energy2chan.v3.0

   c)  run pcarsp -e PCA.energy2chan.v3.0

   (  d)  If in doubt, send your .pha file(s)  to keith.jahoda_at_gsfc.nasa.gov )

***********  begin PCA.energy2chan.v3.0 ***************************
  960414  0  03  3 -5.8585E-01  2.7908E+00 -2.5328E-03 
  960414  1  03  3 -7.2888E-01  2.8721E+00 -2.5849E-03 
  960414  2  03  3 -4.9068E-01  2.7756E+00 -2.1221E-03 
  960414  3  03  3 -2.3356E-01  2.9608E+00 -2.5559E-03 
  960414  4  03  3 -5.3754E-01  2.6586E+00 -2.2590E-03 
  960414  0  12  3 -6.3383E-01  2.7626E+00 -2.3075E-03 
  960414  1  12  3 -7.9802E-01  2.8612E+00 -2.3608E-03 
  960414  2  12  3 -8.2526E-01  2.8369E+00 -2.5239E-03 
  960414  3  12  3 -7.7127E-01  2.9903E+00 -2.7498E-03 
  960414  4  12  3 -6.2568E-01  2.6680E+00 -2.3009E-03 
  960414  0  48  3 -7.4699E-01  2.7690E+00 -2.4966E-03 
  960414  1  48  3 -1.0741E+00  2.9376E+00 -2.7979E-03 
  960414  2  48  3 -4.2258E-01  2.7342E+00 -2.0027E-03 
  960414  3  48  3 -7.5935E-01  2.9948E+00 -2.7710E-03 
  960414  4  48  3 -4.7489E-01  2.6407E+00 -2.2133E-03 
  960321  0   3  3 -5.5887E-01  3.2596E+00 -3.2340E-03
  960321  1   3  3 -9.1218E-01  3.3770E+00 -3.5905E-03
  960321  2   3  3 -6.1349E-01  3.2495E+00 -2.8933E-03
  960321  0  12  3 -6.6335E-01  3.2235E+00 -2.9506E-03
  960321  1  12  3 -8.5148E-01  3.3451E+00 -3.0721E-03
  960321  2  12  3 -9.9509E-01  3.3140E+00 -3.2587E-03
  960321  0  48  3 -9.6264E-01  3.2435E+00 -3.5624E-03
  960321  1  48  3 -1.2931E+00  3.4396E+00 -3.6858E-03
  960321  2  48  3 -7.3424E-01  3.2040E+00 -2.9158E-03
  960321  3   3  3 -5.9660E-01  3.4646E+00 -3.0000E-03
  960321  3  12  3 -5.9660E-01  3.4996E+00 -3.0000E-03
  960321  3  48  3 -5.9660E-01  3.5046E+00 -3.0000E-03
  960321  4   3  3 -4.9834E-01  3.1115E+00 -3.0000E-03
  960321  4  12  3 -4.9834E-01  3.1225E+00 -3.0000E-03
  960321  4  48  3 -4.9834E-01  3.0905E+00 -3.0000E-03
  960101  0   3  3 -3.9371E-01  3.8153E+00 -4.2361E-03
  960101  1   3  3 -6.6697E-01  3.9450E+00 -4.2016E-03
  960101  2   3  3 -6.3655E-01  3.8391E+00 -4.1387E-03
  960101  3   3  3 -7.4455E-03  4.0627E+00 -4.4380E-03
  960101  4   3  3 -3.0178E-01  4.2837E+00 -4.5409E-03
  960101  0  12  3 -5.8790E-01  3.7847E+00 -3.9398E-03
  960101  1  12  3 -7.8308E-01  3.9236E+00 -3.9785E-03
  960101  2  12  3 -9.5597E-01  3.8931E+00 -4.2737E-03
  960101  3  12  3 -7.2415E-01  4.0786E+00 -4.3373E-03
  960101  4  12  3 -2.8071E-01  4.2392E+00 -3.8209E-03
  960101  0  48  3 -6.5238E-01  3.7762E+00 -3.9977E-03
  960101  1  48  3 -1.0509E+00  4.0157E+00 -4.5615E-03
  960101  2  48  3 -5.2030E-01  3.7477E+00 -3.5947E-03
  960101  3  48  3 -7.4972E-01  4.0865E+00 -4.7455E-03
  960101  4  48  3 -1.1452E-01  4.1958E+00 -3.1218E-03
  960101  0  64  3  0.0000E+00  4.3000E+00 -1.0000E-05
  960101  1  64  3  0.0000E+00  3.2000E+00 -1.0000E-05
  960101  2  64  3  0.0000E+00  3.4000E+00 -1.0000E-05
  960101  3  64  3  0.0000E+00  4.0000E+00 -1.0000E-05
  960101  4  64  3  0.0000E+00  3.7000E+00 -1.0000E-05

************   end of PCA.energy2chan.v3.0 ********************


With apologies for this error,

Keith Jahoda
August 28, 1998