PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-18:28:10
G02     219.7          61.9               11.5 +/-    1.03      12.8 +/-    1.03  0.050 / 0.080
G06     49.7           69.3               10.0 +/-    0.51      10.6 +/-    0.51  0.060 / 0.070
G12     320.7          42.7                8.6 +/-    1.66      11.9 +/-    1.66  0.070 / 0.080
G17     60.4           30.0                8.0 +/-    1.53      14.0 +/-    1.53  0.070 / 0.090
G19     40.3           49.2                8.9 +/-    0.60      11.3 +/-    0.60  0.080 / 0.470
G24     258.9          40.8               11.9 +/-    0.97      17.1 +/-    0.97  0.100 / 0.390
G28     124.9          11.1                8.9 +/-    3.19      24.2 +/-    3.19  0.040 / 0.060