|levtype:||ml, pl, sfc|
|year:||1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994|
|type:||an, ea, ef, fa, fc|
|stream:||mnth, moda, msdc, oper, wave|
|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.