## Miscellaneous

- DIVIDE makes the ratio of the R and T spectra. The two spectra must have the same velocity scale.
- FFT plots the power spectrum of the current observation. It might help identify spurious ripples. Editing of the fourier transform is possible, so that these ripples may be suppressed.
- NOISE generates a Gaussian noise as intense as in the current spectrum using the rms value determined by the BASE command, or using a rms value given as an argument. NOISE Value NEW will create a noisy spectrum of given noise level into R, after copying R in T.
- RESAMPLE resamples the R spectrum on the specified grid. If the final sampling is coarser than the original one, a smoothing occurs to the final sampling.
- SMOOTH operates a Hanning smoothing by default and divide the number of channels by two. Other arguments can be specified to use other methods. SMOOTH AUTO uses a sophisticated variable-resolution algorithm, but it requires the channels to be really independent and this is apparently seldom the case in radio astronomy. SMOOTH GAUSS Width convolves the spectrum by Gaussian of given Width in current units; it does not take care of bad channels. SMOOTH BOX N make the average of N adjacent channels and divides the number of channels by N.