DecayFit accepts any ASCII-formatted input files.
The program automatically identifies time-columns from intensity-columns. Time-columns are identified as monotonically increasing, or decreasing, column values.
A single time-column can be followed by multiple intensity columns.
If no time-column is identified in the data file, a dialog is opened for specifying the channel time (ns/channel).
The channel time can also be set after loading the data by going to Tools -> Set ns/channel.