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Brian, I'm wanting to write a large string buffer to an HDS file (around 130 to 140,000 characters) and HDS is complaining because DAT__MXCHR is set to 65535 characters. !! Invalid length encountered in the character type specification ! '_CHAR*137202'; should be in the range 1 to 65535 (possible programming ! error). !! DAT_NEW: Error creating a new HDS component. !! DAT_NEW0C: Error creating a new HDS scalar character component. !! Error closing Spectrum file Can I assume that this is a fundamental limit of HDS (presumably because a byte is used somewhere in the HDS internals to store the size of a string) or is it something that can be changed without changing the file format? I suppose what I'm really asking is whether I need to write some code to split the string into chunks (by finding the longest line, counting the number of lines and then creating a _CHAR*n array of nlines like the FITS extension)... Tim