PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/11-19:57:50
G10     253.2          30.4               15.6 +/-    2.37      27.0 +/-    2.37  0.040 / 0.060
G13     50.4           27.0               12.7 +/-    1.25      23.6 +/-    1.25  0.050 / 0.070
G15     81.5           57.3               14.1 +/-    0.31      16.4 +/-    0.31  0.070 / 0.180
G20     275.1          53.4               16.0 +/-    0.84      19.4 +/-    0.84  0.090 / 0.210
G21     337.0          61.4               14.7 +/-    0.92      16.5 +/-    0.92  0.030 / 0.040
G26     265.4          14.3               14.7 +/-    1.19      37.1 +/-    1.19  0.030 / 0.040
G29     164.5          47.4               14.8 +/-    0.76      19.4 +/-    0.76  0.120 / 0.230