PURPOSE: To return a data structure for a specific time from a FAST l1 common block. USEAGE: dat=get_fa1_seb(t) The routine assumes the l1 common block is already loaded into IDL. KEYWORDS: /START to return data structure for the first time in l1 common block. /EN to return data structure for the last time in l1 common block. /ADVANCE to return the next data structure in the l1 common block. /RETREAT to return the previous data structure in the l1 common block. INDEX=INDEX to return the INDEXth data structure in the l1 common block. /CALIB does nothing. /TIMES returns array of starting times in l1 common block instead of data structure. UNITS=UNITS allows you to choose the returned data's units. Default is compressed. BUGS: None that I know of. UPDATES: