Keywords: class-average

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## Concatenation

The `AVERAGE` command can be used to concatenate spectra of different frequency ranges. This can be done by enabling the `COMPOSITE` mode (`SET ALIGN VELO|FREQ COMPOSITE`).

All the rules presented in the different sections above apply without exception:

- the output abscissa is computed as exposed in section . In particular, the output resolution is set to the coarsest resolution of all the spectra in the index (eq. ), and the output range is the minimal which can contain all the input abscissae ranges,
- the resampling (and averaging in overlapping parts) rules presented at section apply,
- the returned header is also set according to section . In particular, the output integration time is the sum of all the times of input spectra (eq. )7.