|levtype:||ml, pl, sfc|
|month:||jan, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec|
|year:||2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012|
|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.