National Aeronautics and Space Administration

With reference to the status described in the Guide to the LE CCF (EXOSAT Express No. 3 p.36) and to the CCF Update Note no. 1 (EXOSAT Express No. 4 p.43) the following changes have been applied to the LE Current Calibration Files.

Using the terminology introduced in the original article, this CCF is defined as CCF4. The overall SHF key is set to 1983 day 150, and the "last update of cal history" to 1984 day 257.

CCF4 is being distributed with the latest FOT's and should be used instead of older versions. Users not interested in grating data types can take account of the changes to data types B2 and C1 using the information provided in this note. CCF4 is referenced in the FOT Handbook update (Rev. 2) in preparation.