---------------------
This reports None, which is a bug.  There must exist a file in the last directory (2013):
None
---------------------
2013/20130105_v1.00.dat
---------------------
rbspa_pre_ect-rept-sci-L2_20130609_v2.0.0.cdf
---------------------
rbspa_pre_ect-rept-sci-L2_20130604_v1.0.0.cdf