This MFRSR data is part of the ancillary set for 1996 UV inetcomp, Table Mt.

Instruments are:
	YES MFRSR SN203 (2591)
	YES MFRSR SN215 (25B0)

Data for intercomp. collected 6/16/96 - 6/25/96

15 sec sample collected, two minute averages recorded.

Files are named with the following convention:

	iiii.yymmdd.ttt
where
	iiii is the instrument system id (2591 for SN203, and 25B0 for SN215)
	yymmdd is the date
	ttt is file type (mtm for raw binary midnight-to-midnight files
			ccc for cosine corrected datalogger count ascii files
			lang for langley analysis files).

"mtm" data was processed via callang.  
Cosine correction files supplied by YES (dates of scans ??? need to check)
        203.sol
        215.sol
"Unity" calibrations applied (to get cos zenith column in "ccc" files)
	u203.cal
	u215.cal

ASCII files ("ccc") contain 23 columns as follows:
date (decimal day from 1/1/70), cos zenith,
global 1, global 2, global 3, global 4, global 5, global 6, global 7,
diffuse 1, diffuse 2, diffuse 3, diffuse 4, diffuse 5, diffuse 6, diffuse 7,
direct 1, direct 2, direct 3, direct 4, direct 5, direct 6, direct 7. 

where

Ch 1- "Broadband" (unfiltered Si photodetector)
Ch 2- 415nm
Ch 3- 500nm
Ch 4- 610nm
Ch 5- 665nm
Ch 6- 840nm
Ch 7- 9?? check wavelengths

Langley files (".lang") contain the following columns:
date (decimal day from 1/1/70, .25 for am lang, .75 for pm), Ch number,
points between 6? and 2? airmass, points used for regression,
total optical thickness (slope of regression line),
Io extrapolated count value for airmass=0,
some number for the regression fit (small is good),
R^2 (earth sun distance correction factor),
R^2*Io (earth sun dist. corrected Io value).

NOTE: I have looked over this data set and all seems well except for
instrument 203 on 6/18/96:  It was not shading properly in the morning so
diffuse and direct data are bad until about 10 am LST.  
Tony