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                9.2 +/-    4.00      18.5 +/-    4.00  0.020 / 0.020
G07     102.0          60.5                8.6 +/-    1.80       9.7 +/-    1.80  0.030 / 0.020
G08     42.1           22.2                5.7 +/-    4.59      12.0 +/-    4.59  0.040 / 0.030
G09     174.3          14.9                6.5 +/-    3.21      16.3 +/-    3.21  0.040 / 0.040
G11     92.3           42.4                8.0 +/-    3.34      11.2 +/-    3.34  0.080 / 0.110
G13     311.7          26.9                6.7 +/-    3.83      12.5 +/-    3.83  0.080 / 0.120
G17     204.6          34.9                8.5 +/-    3.96      13.4 +/-    3.96  0.110 / 0.190
G18     83.2           23.7                8.2 +/-   29.69      16.6 +/-   29.69  0.080 / 0.200
G28     311.7          60.4               12.7 +/-   28.83      14.4 +/-   28.83  0.100 / 0.160
G30     7.8            76.0                8.4 +/-    2.92       8.6 +/-    2.92  0.070 / 0.130