PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/19-14:27:50
G02     58.5           33.1                6.1 +/-    1.65      10.1 +/-    1.65  0.030 / 0.040
G05     63.7           64.5                7.6 +/-    0.47       8.3 +/-    0.47  0.030 / 0.020
G12     186.8          36.3                9.9 +/-    1.12      15.3 +/-    1.12  0.090 / 0.140
G13     131.5          13.4               11.6 +/-    4.29      29.9 +/-    4.29  0.120 / 0.290
G15     164.2          10.6               -2.3 +/-   23.73      -6.2 +/-   23.73  0.040 / 0.050
G20     207.4          55.6               10.5 +/-    0.54      12.4 +/-    0.54  0.040 / 0.050
G21     270.6          19.3                6.4 +/-    1.21      14.4 +/-    1.21  0.050 / 0.070
G25     239.2          53.3                8.6 +/-    5.26      10.4 +/-    5.26  0.070 / 0.070
G29     331.4          57.3                6.1 +/-    0.50       7.1 +/-    0.50  0.070 / 0.050