FUNCTION: get_ph30(t) PURPOSE: Get a 30 energy step ph structure containing the center (sunward) bins. INPUT: t: double, seconds since 1970. If this time is a vector then the routine will get all samples in between the two times in the vector KEYWORDS: advance: advance to the next data point index: select data by sample index instead of by time. times: if non-zero, return and array of data times corresponding to data samples. CREATED BY: Frank Marcoline from Davin Larson's get_##.pro routines. LAST MODIFICATION: @(#)get_ph30.pro 1.4 99/03/02 NOTES: The procedure "load_3dp_data" must be called first.