PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/18-14:57:50
G02     67.5           25.6                8.3 +/-    0.80      16.0 +/-    0.80  0.030 / 0.040
G05     49.8           54.4                8.3 +/-    0.38      10.0 +/-    0.38  0.030 / 0.040
G12     184.3          24.4               10.1 +/-    1.22      20.0 +/-    1.22  0.030 / 0.050
G13     122.3          21.2               14.4 +/-    1.20      30.8 +/-    1.20  0.040 / 0.040
G15     157.9          19.7               14.4 +/-    2.90      31.8 +/-    2.90  0.090 / 0.200
G20     215.3          68.3               11.8 +/-    0.73      12.6 +/-    0.73  0.080 / 0.200
G21     280.1          26.2                7.9 +/-    1.49      15.1 +/-    1.49  0.090 / 0.150
G25     224.3          44.5                9.8 +/-    0.70      13.3 +/-    0.70  0.130 / 0.210
G29     341.8          68.6                6.7 +/-    0.74       7.2 +/-    0.74  0.050 / 0.090