PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/08/20-21:27:50
G10     253.1          30.3               11.8 +/-    0.91      20.5 +/-    0.91  0.040 / 0.070
G13     50.5           27.1                9.7 +/-    0.94      18.2 +/-    0.94  0.040 / 0.060
G15     81.2           57.1               10.8 +/-    0.44      12.6 +/-    0.44  0.070 / 0.180
G20     274.5          52.9               11.2 +/-    0.59      13.6 +/-    0.59  0.090 / 0.200
G21     336.8          61.4               10.1 +/-    0.75      11.3 +/-    0.75  0.030 / 0.040
G26     265.5          14.4                9.8 +/-    1.60      24.8 +/-    1.60  0.030 / 0.050
G29     164.3          47.0               11.1 +/-    0.90      14.5 +/-    0.90  0.030 / 0.060