Specifies the data processing level to search for. The data processing level is specified by the instrument PI. May not work with all archives.
The value can be entered in of three ways:
# . May be entered as a string or any numeric type for equality matching # . May be a string of the format ‘(min) - (max)’ for range matching # . May be a string of the form ‘(operator) (number)’ where operator is one of: lt gt le ge < > <= >=