PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/12-18:58:00
G07     342.3          61.1               15.2 +/-    0.44      17.1 +/-    0.44  0.040 / 0.040
G08     94.5           54.3               16.1 +/-    1.33      19.4 +/-    1.33  0.040 / 0.030
G09     186.5          67.2               16.1 +/-    0.62      17.3 +/-    0.62  0.080 / 0.100
G11     143.1          16.8               18.8 +/-    3.69      44.9 +/-    3.69  0.050 / 0.090
G23     156.1          30.9               17.0 +/-    1.53      29.2 +/-    1.53  0.030 / 0.040
G27     49.0           27.5               11.4 +/-    1.47      21.0 +/-    1.47  0.030 / 0.040
G28     243.1          35.0               19.7 +/-    2.39      31.2 +/-    2.39  0.070 / 0.070
G30     308.6          41.2               14.3 +/-    1.12      20.4 +/-    1.12  0.060 / 0.060