PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/17-08:58:10
G02     72.6           21.0                4.7 +/-    1.29      10.0 +/-    1.29  0.040 / 0.050
G05     46.2           46.0                3.9 +/-    1.47       5.2 +/-    1.47  0.040 / 0.040
G12     182.9          18.7                6.7 +/-    2.42      15.1 +/-    2.42  0.060 / 0.140
G13     116.4          25.1                6.9 +/-    2.07      13.5 +/-    2.07  0.090 / 0.190
G15     154.0          25.1                7.1 +/-    1.75      13.9 +/-    1.75  0.040 / 0.050
G20     224.0          70.3                7.6 +/-    1.16       8.1 +/-    1.16  0.030 / 0.060
G21     284.5          28.2                3.1 +/-    1.59       5.6 +/-    1.59  0.080 / 0.320
G25     220.9          40.0                6.9 +/-    1.03      10.0 +/-    1.03  0.080 / 0.260
G26     318.0          11.6                0.2 +/-    4.14       0.5 +/-    4.14  0.050 / 0.080
G29     341.2          71.0                5.0 +/-    0.92       5.3 +/-    0.92  0.040 / 0.100