PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-12:42:50
G01     111.7          22.7                6.2 +/-    1.84      12.8 +/-    1.84  0.040 / 0.030
G07     100.3          59.1                6.8 +/-    0.30       7.8 +/-    0.30  0.040 / 0.040
G08     42.4           22.9                4.1 +/-    1.50       8.4 +/-    1.50  0.170 / 0.280
G09     173.9          16.1                5.2 +/-    3.28      12.5 +/-    3.28  0.190 / 0.430
G11     93.5           40.4                4.8 +/-    0.79       6.9 +/-    0.79  0.030 / 0.030
G13     314.6          23.4                2.5 +/-    1.79       5.1 +/-    1.79  0.030 / 0.030
G17     203.2          35.1                7.0 +/-    1.33      11.2 +/-    1.33  0.090 / 0.070
G28     308.2          59.8                3.5 +/-    0.89       4.0 +/-    0.89  0.060 / 0.080
G30     358.3          73.3                6.0 +/-    0.86       6.2 +/-    0.86  0.090 / 0.150