PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/19-13:27:40
G02     36.9           52.5                3.8 +/-    0.46       4.6 +/-    0.46  0.030 / 0.030
G05     137.7          63.8                7.5 +/-    1.17       8.3 +/-    1.17  0.030 / 0.040
G06     54.2           17.4                2.8 +/-    0.60       6.6 +/-    0.60  0.030 / 0.040
G12     199.7          66.0                4.1 +/-    1.66       4.5 +/-    1.66  0.030 / 0.040
G20     199.5          27.5                6.4 +/-    0.98      11.8 +/-    0.98  0.060 / 0.120
G25     292.0          55.6                4.2 +/-    0.80       4.9 +/-    0.80  0.070 / 0.140
G29     311.9          34.6                2.8 +/-    1.27       4.5 +/-    1.27  0.060 / 0.110