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| 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. | 
 button sets all unused
channels to "Intensity".
 turns off all selections.