PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-08:42:50
G02     209.5          53.5                7.7 +/-    0.52       9.3 +/-    0.52  0.080 / 0.200
G06     130.4          81.2                6.5 +/-    0.46       6.6 +/-    0.46  0.070 / 0.220
G12     315.3          27.3                4.1 +/-    1.10       7.5 +/-    1.10  0.030 / 0.050
G17     51.4           36.9                2.9 +/-    1.75       4.5 +/-    1.75  0.030 / 0.080
G19     31.1           53.6                4.1 +/-    0.58       4.9 +/-    0.58  0.060 / 0.110
G24     278.5          42.0                5.8 +/-    1.92       8.2 +/-    1.92  0.090 / 0.130
G28     117.3          18.9                8.3 +/-    0.91      18.8 +/-    0.91  0.020 / 0.010