"sideband, and the other sideband as the
The value is accessed as a position in the spectral system represented by the SpecFrame
attributes inherited by this class, but is stored internally as topocentric frequency.
Thus, if the System attribute of the DSBSpecFrame is set to
" , the Unit
attribute set to
" and the StdOfRest attribute set to
" , then values for
the DSBCentre attribute should be supplied as radio velocity in units of
relative to the kinematic LSR (alternative units may be used by appending a suitable
units string to the end of the value). This value is then converted to topocentric
frequency and stored. If (say) the Unit attribute is subsequently changed to
before retrieving the current value of the DSBCentre attribute, the stored topocentric
frequency will be converted back to LSRK radio velocity, this time in units of
, before being returned.
The default value for this attribute is 30 GHz.