Rest Frequency

ASAP reads the line rest frequency from the RPFITS file when reading the data. The values stored in the RPFITS file are not always correct and so there is a function set_restfreq to set the rest frequencies for the currently selected data.

For each integration, there is a rest-frequency per IF (the rest frequencies are just stored as a list with an index into them). There are a few ways to set the rest frequencies with this function.

If you specify just one rest frequency, then it is set for all IF.

  # Set all IFs
  ASAP>scans.set_restfreqs(freqs=1.667359e9)

If set a rest frequency for each IF, specify a list of frequencies (of length the number of IFs). Regardless of the source, the rest frequency will be set for each IF to the corresponding value in the provided list.

  # Set rest frequency for all IFs
  ASAP>scans.set_restfreqs(freqs=[1.6654018e9,1.667359e9,])

A predetermined ``line catalog'' can be used to set the rest frequency. See section §[*].



Malte Marquarding 2007-08-16