|levtype:||ml, pl, sfc|
|month:||jan, feb, mar, apr|
|year:||2008, 2009, 2010|
|class:||e2, e4, ei, em, ep, er, mc, od, yt|
MARS request efficiency
Data at this level are stored in one file on tape and are best retrieved with a single MARS request and not iterated through. For more information, please refer to our guidelines to write efficient MARS requests.