PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-19:58:10
G01     109.6          24.3               15.5 +/-    1.55      30.8 +/-    1.55  0.100 / 0.140
G07     102.4          60.6               14.6 +/-    0.89      16.5 +/-    0.89  0.080 / 0.150
G08     42.8           25.8               10.9 +/-    2.83      20.9 +/-    2.83  0.180 / 0.150
G09     175.7          16.4               15.7 +/-    1.31      37.8 +/-    1.31  0.230 / 0.110
G11     94.6           43.0               14.2 +/-    0.63      19.7 +/-    0.63  0.090 / 0.210
G13     311.7          26.7               12.7 +/-    1.94      23.9 +/-    1.94  0.130 / 0.190
G17     206.1          31.1               17.1 +/-    1.97      29.3 +/-    1.97  0.020 / 0.030
G18     83.6           24.0               12.4 +/-    1.54      24.7 +/-    1.54  0.020 / 0.020
G28     313.7          60.6               13.2 +/-    0.92      15.0 +/-    0.92  0.040 / 0.040
G30     21.1           77.1               15.1 +/-    0.75      15.4 +/-    0.75  0.040 / 0.040