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The rest signal frequency must be kept fixed. Indeed, the user is trying to
characterize a line at the rest signal frequency. But the rest frequency
axis changed
This equality must be true whatever
. This implies that the reference
channel and the frequency resolution must be recomputed with
![\begin{displaymath}
\ensuremath{i_{\ensuremath{\mathrm{0,new}}}} = \ensuremath{...
...remath{\mathrm{old}}}^{\ensuremath{\mathrm{meas}}}} \right] },
\end{displaymath}](img106.png) |
(59) |
and
 |
(60) |
The last equation just indicates that the channel spacing, which were
measured in the measurement frame, did not changed. Indeed, this is the
source frame (and not the measurement frame) which is changed through this
transformation. The equation for the computation of the rest frequency
resolution from measurement frequency resolution is the usual one
(Eq.
).
Next: The image frequency axis
Up: The MODIFY VELOCITY command
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2023-06-01