PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-13:58:00
G01     110.0          23.9                8.9 +/-    1.23      17.9 +/-    1.23  0.040 / 0.040
G07     102.0          60.5                9.7 +/-    1.18      11.0 +/-    1.18  0.020 / 0.040
G08     42.1           22.2                6.2 +/-    1.62      12.9 +/-    1.62  0.080 / 0.200
G09     174.3          14.9                9.7 +/-    1.41      24.1 +/-    1.41  0.070 / 0.130
G11     92.3           42.4                9.8 +/-    0.30      13.7 +/-    0.30  0.030 / 0.050
G13     311.7          26.9                8.5 +/-    0.78      16.0 +/-    0.78  0.030 / 0.040
G17     204.6          34.9                9.2 +/-    1.67      14.6 +/-    1.67  0.050 / 0.050
G18     83.2           23.7                7.5 +/-    0.72      15.0 +/-    0.72  0.060 / 0.060
G28     311.7          60.4                8.0 +/-    1.20       9.1 +/-    1.20  0.080 / 0.080
G30     7.8            76.0                9.2 +/-    0.54       9.5 +/-    0.54  0.040 / 0.080