SIT Release Notes:

      The following are cumulative release notes for the STEREO/IMPACT  
      Suprathermal Ion Telescope (SIT) Level-1 datasets.  As 
      new datasets are released or old datasets are processed, this 
      file will be extended.   The assessment of data quality, such 
      as for  instrument  saturations,  represents the best current
      knowledge and may be retroactively updated in future releases.
      
      General notes and caveats regarding all SIT data are in another
      file (sit_caveats) that should consulted first. 

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	SIT-A first operational data begins Jan 1, 2007

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	SIT-B first operational data begins Jan 27, 2007
							
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	posted 5/15/2009:
	2009-132 22:59 (May 12) - 2009-136 02:40 (May 16)  SIT-B out of calibration due to S/C reset
	
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	posted 8/10/2009:
	2009-216 09:35  (Aug 4)  - 2009-218  12:30 (Aug 6)    SIT-A out of calibration due to S/C reset
							
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	posted 5/27/2010:
	2010-144 12:27 (May 24) - 2010-146 03:35 (May 26)  SIT-B data gap due to lack of DSN coverage;
										some other smaller gaps in May 2010 for same reason

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	posted 1/14/2011:
	2011-008 21:25 (Jan 8) - 2011-013 19:11 (Jan 13)  SIT-B out of calibration due to IMPACT power off
							
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	posted 4/20/2011:
	2011-110 14:00  (April 20) -- SIT-A revised lookup tables improve accuracy of intensity boxes above
							~1 MeV/nucleon;  starting on day 111.0, onboard ROM boxes are used
							to calculate SIT-A intensities, with improved statistics in intense periods
							
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	posted 5/10/2011:
	2011-125 17:04  (May 5) -- SIT-B revised lookup tables improve accuracy of track widths 
							for rate boxes;  starting on day 127.0, onboard ROM boxes are used
							to calculate SIT-B intensities, with improved statistics in intense periods
							
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	posted 7/12/2011:
	ROM box correction factors used to correct for coarseness in on-board matrix binning;  applied to 
							SIT-A starting 2011/110 and SIT-B 2011/125 (not used for earlier data).
	Errors affecting pulse-height analysis intensity calculation during some periods corrected
	To be sure up to date intensities are used, users should replace all earlier files with files generated 
							on or after July 11, 2011
							
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	posted 9/23/2011:
	2011-262-15:40 (Sept 19) to 2011-265-19:53 (Sept 22)-- SIT-A out of calibration due to IMPACT power off	
								
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	posted 11/21/2012:
	2012-205.0 (July 23) to 2012-207.0 (July 26) -- SIT-A out of calibration due to high intensities
								
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