PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-08:43:10
G01     219.9          10.9                4.7 +/-    2.90      12.9 +/-    2.90  0.160 / 0.420
G03     267.0          68.8                3.3 +/-    0.74       3.5 +/-    0.74  0.140 / 0.300
G09     300.2          15.4                2.9 +/-    3.01       7.0 +/-    3.01  0.100 / 0.340
G14     95.0           17.1                3.8 +/-    2.04       9.0 +/-    2.04  0.090 / 0.420
G16     139.3          53.4                7.6 +/-    0.85       9.2 +/-    0.85  0.030 / 0.050
G22     199.1          62.4                4.9 +/-    1.06       5.4 +/-    1.06  0.040 / 0.040
G23     313.0          42.5                3.8 +/-    1.45       5.3 +/-    1.45  0.050 / 0.050
G26     83.0           54.9                4.9 +/-    0.39       5.9 +/-    0.39  0.040 / 0.050
G31     48.6           25.2                3.1 +/-    0.52       6.1 +/-    0.52  0.070 / 0.090