PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-14:57:50
G01     76.5           33.3                8.1 +/-    0.67      13.3 +/-    0.67  0.030 / 0.040
G07     134.5          35.4                8.1 +/-    1.20      12.7 +/-    1.20  0.030 / 0.030
G11     56.9           33.4                6.5 +/-    0.66      10.7 +/-    0.66  0.060 / 0.130
G13     280.4          37.9                7.4 +/-    1.25      11.1 +/-    1.25  0.050 / 0.120
G15     308.8          12.6                6.1 +/-    1.12      16.2 +/-    1.12  0.060 / 0.090
G17     225.9          64.8                9.5 +/-    0.71      10.4 +/-    0.71  0.050 / 0.100
G18     52.7           20.2                6.3 +/-    1.35      13.9 +/-    1.35  0.040 / 0.060
G19     220.8          34.6                8.8 +/-    1.54      14.1 +/-    1.54  0.030 / 0.060
G28     10.7           60.3                6.7 +/-    0.46       7.6 +/-    0.46  0.040 / 0.090
G30     129.4          67.5                7.4 +/-    0.71       7.9 +/-    0.71  0.050 / 0.080