PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-20:12:50
G01     108.8          24.7               15.1 +/-    1.91      29.7 +/-    1.91  0.070 / 0.130
G07     103.7          60.0               13.1 +/-    0.66      14.8 +/-    0.66  0.080 / 0.140
G08     42.7           25.3               10.4 +/-    2.35      20.1 +/-    2.35  0.220 / 0.120
G09     175.6          15.7               15.9 +/-    1.60      38.9 +/-    1.60  0.090 / 0.080
G11     93.6           43.1               12.6 +/-    1.32      17.4 +/-    1.32  0.110 / 0.120
G13     311.1          27.2               11.0 +/-    1.39      20.5 +/-    1.39  0.120 / 0.160
G17     206.5          31.7               14.5 +/-    1.70      24.6 +/-    1.70  0.030 / 0.030
G18     82.8           24.1               12.4 +/-    1.68      24.7 +/-    1.68  0.030 / 0.030
G28     315.3          60.8               11.5 +/-    0.92      13.0 +/-    0.92  0.040 / 0.040
G30     25.0           77.5               12.1 +/-    0.90      12.3 +/-    0.90  0.040 / 0.040