read o file\ANHEADER.M ...........\CHECK_T.M ...........\eph.dat ...........\e_r_corr.m ...........\FEPOCH_0.M ...........\FIND_EPH.M ...........\FOBS_TYP.M ...........\GPS_TIME.M ...........\GRABDATA.M ...........\JULDAY.M ...........\main.M ...........\RINEXE.M ...........\SITE247J.01O ...........\TOGEOD.M ...........\TOPOCENT.M ...........\TOPO_ENU.M read o file