************************ COLOUR INDEX DATA ******************************
* from the visible spectrometer of IUP/Uni-Heidelberg operated at IRF,	*
* Kiruna (68 degrees N, 20 degrees E)					*
* The files contain the start time, stop time, solar zenith angle,	*
* solar azimuth, and ratio of the average intensities at approximately  *
* 680 nm and 380 nm							*
* in the solar zenith angle range from 85 to 99 degrees                 *
*									*
*                 !!!   DATA VALIDITY IS NOT CHECKED  !!!		*
*************************************************************************

NOTE

1. The spectrometer has been subject to technical service during extended
periods in the winter of 1999-2000.  Curves that show no variation
with solar zenith angle indicate a constant dark current signal due to
heating of the detector to +30 degrees C for removal of water
vapour. Normal working temperature is -30 degrees C.

2. The plotting routines were reimplemented during the spring of 2003 after
a change of the main computer in the autumn of 2002.
The quality of the present data (from March 2003) is uncertain.