PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-13:28:10
G01     125.5          12.7                6.5 +/-    1.96      17.2 +/-    1.96  0.030 / 0.030
G07     65.3           67.1                7.4 +/-    0.51       7.9 +/-    0.51  0.030 / 0.030
G08     48.6           36.4                5.0 +/-    1.62       7.8 +/-    1.62  0.090 / 0.390
G09     176.4          32.8               -0.2 +/-   11.42      -0.4 +/-   11.42  0.090 / 0.330
G11     113.3          34.9                7.0 +/-    3.01      11.2 +/-    3.01  0.040 / 0.040
G13     321.4          11.1               -6.0 +/-   15.43     -16.4 +/-   15.43  0.040 / 0.050
G17     199.4          18.8                6.4 +/-    1.72      14.5 +/-    1.72  0.080 / 0.230
G28     279.1          53.6              -56.0 +/-   62.43     -67.7 +/-   62.43  0.130 / 0.270
G30     332.1          59.7                6.5 +/-    1.13       7.3 +/-    1.13  0.110 / 0.580