ANCHORS version is coded with 4 parts, separated with a decimal point:
- source detection/regions version
- yaxx version
- post_yaxx version
- unused (web version?)

e.g. Trumpler 14 was processed on Jan 23, 2006 using ANCHORS version 2.1.1.1

Current production version - as of May 01, 2007
3.3a.2.2 * constrain initial cstat kt to under 10 keV
3.3a.2.2L * pipeline run on Linux 

Changes between versions are tracked below.
Minor versions can be designated with lower case alphabetic
 characters (a-z) if absolutly necessary.
Test versions can be designated with a 't' following the version number.

*************************************************************
SOURCE DETECTION VERSIONS
-------------------------------------------------------------
1- 3 band wavdetect recursive blocking source detection.
   elliptical regions using empirical formula.
   recentering algorithm applied

2- revert to 1 wide band recursive blocking detection for automation,
   no recentering

3t- 1 band r.b. detection
   CAL elliptical regions
   recentering
   auto backgrounds from excluded source field 

3- switch to improved ellipse rotations using empirical formula:
   rot_angle=phi*0.47+146.6-ROLL (+360 mod 180)

4- add multi-band r.b. detection

*************************************************************
YAXX VERSIONS
-------------------------------------------------------------
1-  yaxx_0.05
2-  yaxx_0.05 w/ cstat stats for < 30 cnt sources (unbinned)
                 chi gehrels for > 30 cnt sources (binned)
3-  yaxx_0.98 - change to chi dvar for binned data
3a-  yaxx_0.98 - constrain initial cstat kT to under 10 keV

*************************************************************
POST_YAXX VERSIONS
-------------------------------------------------------------
1- compile data, bblocks, quantiles, 2mass matching,
   post to web area.
2- add glvary, hardness ratios
3- add literature search results, distance, mass etc.
4- add register with NVO

*************************************************************
WEB VERSIONS
-------------------------------------------------------------
1- XML version 1
 - web version 1c is a temporary designation to indicate
   cstat results are displayed.
2- add glvary, cstat, xsl and css advancements, overlib mouseovers

* Custom runs are indicated with a 'c' for appropriate part.  Explain below:
*************************************************************
CUSTOM RUNS
-------------------------------------------------------------
02556 RCW38 processed Feb 02, 2006 version c.c.1.1
            - source detect and regions from original manual analysis
            - yaxx_0.05 w/ cstat stats for < 30 cnt sources (unbinned)
                 chi gehrels for > 30 cnt sources (binned)
              may become standard, but call custom here

04479 Serpens processed Nov 01, 2006 version c.2.1.1
            - run with version 3.2.1.1 (bbrs only) but with original
                source list and regions.
            - run with reprocessed evt2 file (ASCDSVER 7.6.7.2, 5/06)
                with energy filter (300-8000 eV)

04495 Trumpler 14 processed May 16-23, 2007 version 3c.3a.2.2
   crowded field so some background regions have no counts due
   to swiss cheese holes made by nearby sources.
   Have selected common background regions for sources less than 0.5 arcmin
   off-axis.
   common backgrounds:
   chip 2 circle(4218.5,4164.5,19.8)
   chip 3 circle(3946.5,4014.5,19.8)
   yaxx processing and the rest stay the same, 3a.2.2

02556 RCW38 processed May 16-23, 2007 version 3c.3a.2.2
  same problem as Trumpler 14 but the cluster is off-axis so select
  sources for a common background with a box:
  4314 < x < 4538
  3938 < y < 4130
  i.e. box(4426,4034,112,96)   (all sources on chip 3)
  common background:
  circle(4324.5,3840.5,44.7428)