PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/16-13:57:30
G01     82.1           32.8                2.1 +/-   12.62       3.4 +/-   12.62  0.230 / 0.240
G07     131.0          36.7                8.8 +/-    1.08      13.5 +/-    1.08  0.190 / 0.250
G11     60.4           34.2                6.7 +/-    2.59      10.9 +/-    2.59  0.030 / 0.020
G13     289.1          36.3                7.9 +/-    2.30      12.2 +/-    2.30  0.030 / 0.020
G15     312.8          11.2                1.1 +/-   13.13       3.1 +/-   13.13  0.040 / 0.060
G17     220.2          62.8               14.9 +/-   11.98      16.6 +/-   11.98  0.040 / 0.060
G19     217.8          35.0               -2.0 +/-   39.44      -3.1 +/-   39.44  0.050 / 0.090
G28     2.1            60.9                6.5 +/-    1.02       7.4 +/-    1.02  0.080 / 0.090
G30     118.1          73.0                4.6 +/-    6.79       4.8 +/-    6.79  0.050 / 0.050