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Workspace Method f_gridFromSensorAMSUgeneric
Automatcially calculate f_grid to match the sensor.
This function is based on 'f_gridFromSensorAMSU'
The method calculates f_grid to match the instrument, as given by
the backend frequencies f_backend, and the backend channel
You have to specify the desired spacing in the keyword *spacing*,
which has a default value of 100 MHz. (The actual value is 0.1e9,
since our unit is Hz.)
The produced grid will not have exactly the requested spacing, but
it will not be coarser than requested. The algorithm starts with the band
edges, then adds additional points until the spacing is at least as
fine as requested.
Authors: Oscar Isoz