PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/19-22:12:50
G02     40.5907        49.8103          9.2205 +/-  1.3981   11.6556 +/-  1.3981  0.070 / 0.050
G05     117.6410       69.6033         10.2594 +/-  0.8790   10.8697 +/-  0.8790  0.060 / 0.060
G12     188.5572       52.5542         11.1188 +/-  0.6471   13.6059 +/-  0.6471  0.030 / 0.050
G20     199.5867       40.4093         11.2641 +/-  0.3700   16.2748 +/-  0.3700  0.040 / 0.050
G25     265.9809       60.3371          9.6538 +/-  1.1341   10.9314 +/-  1.1341  0.030 / 0.040
G29     316.3500       38.6696          9.4680 +/-  1.2346   14.0790 +/-  1.2346  0.030 / 0.040