PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-17:57:40
G07     331.6          57.4               10.8 +/-    0.87      12.5 +/-    0.87  0.030 / 0.060
G08     105.8          52.5               12.2 +/-    0.48      14.9 +/-    0.48  0.030 / 0.040
G09     194.0          74.5               12.6 +/-    0.72      13.0 +/-    0.72  0.050 / 0.090
G11     147.3          12.5               13.2 +/-    3.56      34.9 +/-    3.56  0.060 / 0.100
G23     153.8          37.4               12.4 +/-    1.97      18.8 +/-    1.97  0.040 / 0.060
G27     55.0           31.5               10.3 +/-    0.54      17.4 +/-    0.54  0.030 / 0.050
G28     237.2          29.6               12.9 +/-    1.96      22.7 +/-    1.96  0.090 / 0.480
G30     302.7          36.2               11.6 +/-    0.73      18.1 +/-    0.73  0.080 / 0.590