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It is beyond the scope of the this documentation to provide explanations to the MARS Retrieval parameters and in general about MARS. Instead, it is strongly recommended to consult the MARS user documentation and especially the MARS keywords documentation to find out details about the MARS keywords..
The MARS Catalogue is an extremely useful site where you can browse the contents of the full archive. When you reach the page in the catalogue where the actual parameters, steps and levels to be retrieved appear you will find a View the MARS Request link.
Clicking on this link and selecting the Metview macro tab you will see the Macro code defining the retrieval.