FUNCTION: MVN_SPC_ANC_PF Purpose: returns and array of structures that contain data from MAVEN drf files USAGE: data = mvn_spc_anc_pf() printdat,data ; display contents store_data,'GNC',data=data ; store for tplot KEYWORDS: TRANGE=TRANGE ; Optional 2 element time range vector $LastChangedBy: $ $LastChangedDate: $ $LastChangedRevision: $ $URL: $