MOPS would like a refstack for the STS fields.

The previous STS.refstack.20110613,20110615 wasn't usable as it was destroyed by magic.

STS.20120510 was made using a similar number of inputs from the best exposures from 2011. Not pretty but hopefully sufficient.

Details to add:
 * FWHM of test stacks (STS.reftest.20120510.c#f#) like done with MD refstacks
 * unconv vs convolved stacks and issues found
 * test diffims with recent STS data


|| [[Image(STS_i_smf_fieldcolor.png,300px)]] || 7 projections and their skycell overlap. ||

Approximate pattern, E left, N up:
{{{
 1 2     
3 4 5   
 6 7
}}}


rawExp comment name details 
{{{
--> GIQ - shorter exp_time (20s) to not saturate more in better conditions
--> ND - no dither so always with center and typically with 30s, occational NDGIQ
--> NOM - ?
--> 000,090,180,270 - rotator to keep rough PA on field over season
--> PP1-7 - 7 pointings
--> dither 1-4 - dither shifts (by X?) and typically with GIQ
}}}

Sample diffims for projection 1 

Rerun of sample diffims for projection 1 and published under IPP-MOPS-TEST2