@macumber I believe it is generic tab-separated file (with specific requirements as to what goes where). It is documented here:

http://www.bfrl.nist.gov/IAQanalysis/CONTAM/manual/Content/html/IDH_UsingControls_CVF.htm

This was my first use of TimeSeries objects so it is a bit clunky. Probably could get away from storing all the series.