... Opening an EK file with this routine makes the EK accessible to the following CSPICE EK access routines, all of which modify the target EK file: Begin segment: ekbseg_c Append, insert, delete records: ekappr_c ekinsr_c ekdelr_c Add column entries: ekacec_c ekaced_c ekacei_c Update existing column entries: ekucec_c ekuced_c ekucei_c Execute fast write: ekifld_c ekffld_c ekaclc_c ekacld_c ekacli_c An EK opened for write access is also accessible for reading. ... Index_Entries open EK for writing . ...