PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-13:43:00
G01     79.1           33.0                7.6 +/-    0.64      12.5 +/-    0.64  0.030 / 0.040
G07     132.8          34.6                7.9 +/-    0.88      12.7 +/-    0.88  0.040 / 0.030
G11     58.2           32.8                6.6 +/-    1.00      10.9 +/-    1.00  0.050 / 0.090
G13     286.0          36.7                6.8 +/-    1.48      10.5 +/-    1.48  0.070 / 0.080
G15     310.7          12.3                4.5 +/-    1.35      12.0 +/-    1.35  0.070 / 0.120
G17     223.2          65.3               10.6 +/-    1.23      11.5 +/-    1.23  0.080 / 0.120
G19     219.3          37.4               10.7 +/-    1.90      16.2 +/-    1.90  0.040 / 0.040
G28     7.0            60.5                6.8 +/-    0.56       7.7 +/-    0.56  0.040 / 0.040
G30     123.6          70.7                7.4 +/-    0.77       7.8 +/-    0.77  0.050 / 0.100