PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/17-06:43:10
G10     246.1          22.5                6.2 +/-    2.09      12.9 +/-    2.09  0.140 / 0.370
G13     59.3           33.0                4.7 +/-    0.79       7.8 +/-    0.79  0.120 / 0.320
G15     96.4           57.4                6.1 +/-    0.62       7.1 +/-    0.62  0.040 / 0.040
G16     300.9          15.4                1.4 +/-    1.34       3.3 +/-    1.34  0.040 / 0.040
G20     336.1          73.6                4.8 +/-    0.43       4.9 +/-    0.43  0.030 / 0.040
G21     327.5          56.6                4.3 +/-    0.52       5.0 +/-    0.52  0.030 / 0.040
G26     272.0          17.7                4.9 +/-    1.53      11.4 +/-    1.53  0.040 / 0.010
G29     163.2          56.2                5.9 +/-    0.26       6.9 +/-    0.26  0.040 / 0.020