RadMC3DWriter.
write_line_file
This method writes out fields in the format radmc3d needs to compute line emission.
field : string or list of 3 strings
If a string, the name of the field to be written out. If a list, three fields that will be written to the file as a vector quantity.
filename : string
The name of the file to write the data to. The filenames radmc3d expects for its various modes of operation are described in the radmc3d manual.