The 16-bit FOS accumulators were limited to 65536 counts in any individual read out before they would "wrap around". The following IDL code (fos_overflow.pro) presents an improved algorithm for removing detector "wrap-around" from FOS observations. This code has not been incorporated into STSDAS. It is provided here on an "as-is" basis as an algorithm that has been used by members or the FOS team to "unwrap" some special cases which were not handled successfully by the STSDAS unwrap algorithm. Thorough testing of the code to insure complete backward compatibility with the STSDAS unwrap algorithm has not been performed. Although the fos_overflow.pro algorithm has not failed in any application to date, no warranty, express or implied, is provided.

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