Should the SideBand attribute be taken into account when aligning this DSBSpecFrame with another DSBSpecFrame?
When AST_FINDFRAME or AST_CONVERT is used on two DSBSpecFrames (potentially describing different spectral coordinate systems and/or sidebands), it returns a Mapping which can be used to transform a position in one DSBSpecFrame into the corresponding position in the other. The Mapping is made up of the following steps in the indicated order:
If both DSBSpecFrames have a value of 1 for the AlignSideBand attribute, map values from the target’
s current sideband (given by its SideBand attribute) to the observed sideband (whether USB or LSB). If
the target already represents the observed sideband, this step will leave the values unchanged. If
either of the two DSBSpecFrames have a value of zero for its AlignSideBand attribute, then this step is
omitted.
Map the values from the spectral system of the target to the spectral system of the template. This Mapping takes into account all the inherited SpecFrame attributes such as System, StdOfRest, Unit, etc.
If both DSBSpecFrames have a value of 1 for the AlignSideBand attribute, map values from the result’
s observed sideband to the result’
s current sideband (given by its SideBand attribute). If the result
already represents the observed sideband, this step will leave the values unchanged. If either of the
two DSBSpecFrames have a value of zero for its AlignSideBand attribute, then this step is omitted.