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Workspace Variable f_index

Frequency index. 

Not all methods handle all monochromatic frequencies (of f_grid) in
parellel and this variable is used for communication between methods,
holding the index of the frequency treated presently.

In some contexts, a negative f_index means all frequencies.

Usage: Method output.

Group: Index

Specific methods that can generate f_index

Generic and supergeneric methods that can generate f_index

Specific methods that require f_index

Generic and supergeneric methods that can use f_index

Agendas that can generate f_index

Agendas that require f_index