Re: isis-1.0.8 is available

Replying to John's questions about pileup;

The print_kernel gives me, e.g., (similar for psffrac~0.95 or for the other 
source)
isis> print_kernel(1);                          
1: 0.211913     0.929297
2: 0.029725     0.0673295
3: 0.00277968   0.00325211
4: 0.000194952  0.000117811
5: 1.09384e-05  3.41426e-06
*** pileup fraction: 0.0707029
where
 26  pileup<1>.nregions     0     1                 1            1           10
 27  pileup<1>.g0           0     1                 1            0            1
 28  pileup<1>.alpha        0     0         0.5165195            0            1
 29  pileup<1>.psffrac      0     1               0.9          0.9         0.95
 I expected a pileup fraction of ~9% based on PIMMS, so this is pretty close 
(not sure what to make of the other output).  Alpha does change in the 
opposite direction to psffrac, but the source model parameters don't seem to 
change significantly (of order 1% or less).

For one source, I get alpha=0.43 when psffrac=0.95, alpha=0.52 when 
psffrac=0.9.  For the other, I get alpha=0.53 when psffrac=0.95, and 
alpha=0.62 when psffrac=0.9. The fits are about equally good for either set of 
values. Generally alpha seems to have (90%) errors of ~0.07 to 0.14 or so 
either way for any fixed psffrac value.

-Craig