PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/19-14:12:40
G01     67.0           32.1                7.1 +/-    0.83      11.9 +/-    0.83  0.120 / 0.250
G07     138.9          25.4                7.0 +/-    2.13      13.6 +/-    2.13  0.070 / 0.220
G11     50.8           26.1                4.7 +/-    1.70       9.0 +/-    1.70  0.030 / 0.030
G13     273.1          36.4                8.8 +/-    1.42      13.7 +/-    1.42  0.030 / 0.020
G15     302.2          14.9                2.3 +/-    1.30       5.8 +/-    1.30  0.050 / 0.100
G17     242.6          74.4                7.9 +/-    0.42       8.2 +/-    0.42  0.060 / 0.100
G19     226.9          46.9                8.8 +/-    2.07      11.5 +/-    2.07  0.050 / 0.090
G28     25.2           58.3                9.6 +/-    0.84      11.0 +/-    0.84  0.050 / 0.080
G30     137.8          61.0                6.8 +/-    0.67       7.7 +/-    0.67  0.050 / 0.080