Anomalies seen in the Plots created by rad_compare
     updated 5/7/01 dd

   -------------------
   Key:  
    ** - anomaly not yet explained or investigated
    OK - anomaly is explained
    !! - anomaly is or could be a "real" measurement change
    :) - no unexplained anomalies
   -------------------

MA1025  (010301/001207)
 OK - zero jump at 0.93 keV (high zo Chi2)
       4/4-OK: SSD/fitting problem, reanalyzed, lowered Chi2
 OK - first second-order point consistantly ~12% low in all regions
       5/8-OK: fits look good.  Error on ref ratio is 6% one sigma -
        ref stat error could create this easily.  Note that the Chi2
        is not large for the regions.
 :)

MA1026  (010301/001101)
 :)

MB1148  (010302/001117)
 !! - zero-order change at MB1148m4 +15% at 0.93 keV
       4/4 data look alright, real change or just stat fluke?
 OK - first-order 0.93 keV 10% high in m4 and all regions
 !!    5/4 Conclude that it's probably either:
            i) some ref/PSPC thing common to '1148 and '1158 ( and also
               showing up in some HEG tests...)
                 OR
           ii) it may be a rad effect that BOTH '1148 and '1158 experienced,
               if they were both rad-exposed.

MB1158  (010302/001117)
 OK - second order Chi2 large - poor fitting of small signals
       4/4 exclude poor fits/measurements
 :)

MA1022  (010307/001116)
 :)

ME1409  (010307/001127)
 OK - large second-order Chi2 in m=-2 Mg in region p8
       5/8 low number of second order counts gave rise to a poor fit
           (115 counts in ROI yet gaussian fit gave 134...)
 :)

HC2214  (010308/001101)
 OK - large second-order Chi2
       5/7 3 regions OK, 2 regions CHi2 < 6.0.
 :)

HC2259  (010308/001101)
 OK - minus 20% change in first-order 0.93 keV m=+1 effic in p8,
 !!   other regions too
       5/4 improved HEG Cu-L line fitting and effect is more like
           only -10% averaged over the five regions.  Unfortunately
           we don't have the 001101 m=+1 Cu-L measurements for HC2214
           which was tested at the same time as '2259...
           This effect feels like the MB1148 problem of Cu-L
           measurement systematic effects...
       5/7 The HX220 ratios are within 3% for 001101 and 010308,
           so most of the 10% effect is from the grating... and
           counting uncertainty of few per cent.
 OK - second-order large change in region m8 at one energy, 1.49 keV    
       5/8 A complete mis-fit of the 2nd order 010308 distribution:
           634 ROI counts yet Gaussian fit is only 167.

HB2104  (010309/001113)
 ** - first-order in p4 region looks 5-10% low over all energies --
      this is isolated to one test region of the grating --
      don't see anything like this in other gratings/regions,
      what's the cause?  Same effect is reducing the first two
      second order points (1.25 and 1.49 keV) in p4?
 ** - large zero-order Chi2, 4 of 5 regions have 5% drop in effic at 1.25 keV
 ** - large second-order Chi2 in region p0 at m=-2 4.5 and 6.4 keV

HE2426  (010309/001115)
 OK - large second-order Chi2 in m8 (Al-K +1 order)
       5/7 re-analysis reduced the Chi2.
 :)

HE2412  (010312/001115)
 OK - large zero-order Chi2: 5% drop in effic at 1.25 keV
       5/7 OK: looks statistical...
 :)

HF2517  (010312/001114)
 OK - first-orders at 0.93 keV: one higher, one lower by ~15%.
 !!    5/4 re-analysis reduced the effect a little... a la '2259.
       5/7 The reference measurements are only 4% different, so
           it appears to be mostly in the grating...
 ** - large zero-order Chi2: ~5% increase in effic at 1.25 keV
 ** - second-order Chi2 at one energy in m8 region

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