PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/15-15:43:30
G10     260.4          33.4               10.0 +/-    1.90      16.4 +/-    1.90  0.160 / 0.250
G13     45.9           24.0                6.5 +/-    0.66      12.9 +/-    0.66  0.140 / 0.330
G15     65.7           51.8                9.3 +/-    0.37      11.5 +/-    0.37  0.120 / 0.350
G16     289.3          12.8                8.7 +/-    2.17      22.7 +/-    2.17  0.130 / 0.460
G18     291.0          63.3                9.4 +/-    0.87      10.4 +/-    0.87  0.140 / 0.440
G20     48.5           42.2                8.2 +/-    0.65      11.5 +/-    0.65  0.140 / 0.410
G21     4.1            70.6               10.1 +/-    0.89      10.7 +/-    0.89  0.070 / 0.190
G26     260.4          10.8                7.9 +/-    1.56      21.7 +/-    1.56  0.080 / 0.190
G27     320.5          15.0                6.4 +/-    2.37      15.9 +/-    2.37  0.050 / 0.050
G29     165.3          33.8               12.1 +/-    1.44      19.7 +/-    1.44  0.050 / 0.050