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    | Frequency | The frequency channel (there must be only one of these).
            If none are selected, the point number is used for the
            frequency. | 
        
| Intensity | An intensity channel. Any number can be selected; each
            selected intensity channel results in a separate
            experimental plot on import. If none are selected, a line
            list is assumed. | 
        
| Frequency Std Dev | 
          A channel containing estimated standard deviations of the
            frequency. Currently, these are only used while peak
            measuring from line lists. If not wanted, do not select. | 
        
| Intensity Std Dev | A channel containing estimated standard deviations of the intensity. If not wanted, do not select. | 
 button turns off all selections.