|month:||jan, feb, mar, apr, may, jun, jul, aug, sep|
|year:||2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023|
|type:||4v, an, fc|
|stream:||gfas, 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.