OptionaldateNever set: ASCII files write their dates in the locale of the instrument
computer, so the order of day and month is unknown. The text is kept in
the spectrum creationDate and modificationDate.
The binary file description (e.g. 2D constant interval DataSet file),
or the first line of an ASCII file with its padding collapsed
(e.g. PE UV SPECTRUM ASCII PEDS 1.60).
Variant of the file: pepe is the binary block file (signature PEPE),
peds the ASCII export (first line PE … ASCII PEDS <version>).
Units of the X axis of the first spectrum, as written in the file
(e.g. nm, cm-1).
File-level metadata of a PerkinElmer
.spfile.