The ISHA parameter was tested in a small set of runs and we concluded that it had small effect on the pulse shape, we then had changes to this parameter in only five APV:

RDO=2    ARM=0    GROUP=0    APV=0    VPSP=45         LAT=87  # run 12: 1BC
            APV=1    VPSP=45         LAT=87
            APV=2    VPSP=46         LAT=87
            APV=3    VPSP=46         LAT=87
            APV=4    VPSP=46         LAT=87
            APV=5    VPSP=44         LAT=87  ISHA=46
            APV=6    VPSP=43         LAT=87  ISHA=45
            APV=7    VPSP=45         LAT=87  ISHA=44  nominal value found in the configuration file
            APV=8    VPSP=45         LAT=87  ISHA=47
            APV=9    VPSP=45         LAT=87  ISHA=48  

The decay time of the pulses was obtained from Len's fit in pulses that had adcmax (peak value of the pulse) > 300 and chi2/dof<2.

Figure 1 ISHA=46

figure 2  ISHA=45

Figure 3  ISHA=44 Nominal value

Figure 4  ISHA = 47

Figure 5 ISHA=48

There is some variation but weaker that the one we found with VFS. To repeat a similar study as the one performed on VFS we would need to apply ISHA changes to many more parameters and take comparable number of events. The conclusion about ISHA so far would be, lets skip it.