Determination of  Saturation Threshold with New H array
                                           2MASS - 990929n

Purpose: To determine saturation thresholds, e.g. for new H array.

Data: 990929n (this night was chosen because it shows stable flat since with new H array).

Method:  The  saturation thresholds were obtained using a linear fit and  the threshold is determined
                         where read2 shows 1% deviation  from the  fit. This method is described in details
                           in previous Bill Wheaton's memo  for the night 970608s.

Results:
   1) J band
       Figure 1.   J camera Saturation Curve
         Figure 2   Histogram of RMS Residuals
         Figure 3   Summary of residual distribution: The saturation threshold is determined using 50% (median) curve
                            where the deviation percent is 1%.
                           The saturation threshold for J is 45,000 ADU.

   2) H band
       Figure 4.   H camera Saturation Curve
         Figure 5  Histogram of RMS Residuals
         Figure 6  Summary of residual distribution: The saturation threshold is determined using 50% (median) curve
                            where the deviation percent is 1%.
                           The saturation threshold for h is 50,100 ADU.
 
 

   3) K band
     Figure 7.  K camera Saturation Curve
      Figure 8   Histogram of RMS Residuals
      Figure 9   Summary of residual distribution: The saturation threshold is determined using 50% (median) curve
                            where the deviation percent is 1%.
                           The saturation threshold for K is 46,000 ADU.

Comparison with previously studied night.

 night        990929n              970608n (for more info click  here)
   J       45,000  ADU                  43,000 ADU
   H      50,100  ADU                 46,000 ADU
   K      48,000  ADU                 46,000 ADU