PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-17:58:10
G02     209.7          48.0               12.2 +/-    0.64      15.7 +/-    0.64  0.060 / 0.060
G06     95.3           78.6               10.6 +/-    0.46      10.8 +/-    0.46  0.100 / 0.080
G12     315.8          30.3                9.4 +/-    1.04      16.4 +/-    1.04  0.090 / 0.110
G17     49.0           38.8                7.7 +/-    1.12      11.4 +/-    1.12  0.060 / 0.100
G19     21.8           57.9                9.2 +/-    1.06      10.7 +/-    1.06  0.030 / 0.030
G24     277.8          42.9               11.3 +/-    0.46      15.8 +/-    0.46  0.030 / 0.020
G28     115.2          21.2                9.5 +/-    1.39      20.2 +/-    1.39  0.050 / 0.030