Pick Channels Dialog

This dialog is shown if you try and load a data file with more than two channels of data.
 
Each channel has an entry in the grid, with the mimimum and maximum values displayed. For each channel you can pick:
Frequency The frequency channel (there must be only one of these).
Intensity An Intensity channel (there can be one or more of these).
Weights A Weight channel, used as a relative error when contour fitting. There must either be none of these, or one for each intensity channel.
Discard The channel is discarded.
The All button sets all unused channels to "Intensity".