PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/23-01:58:00
G07     321.0          53.0                2.4 +/-    0.49       3.0 +/-    0.49  0.180 / 0.280
G08     113.4          48.3                6.1 +/-    0.72       7.8 +/-    0.72  0.130 / 0.320
G09     227.7          82.0                4.0 +/-    0.21       4.0 +/-    0.21  0.040 / 0.050
G16     43.8           17.6                2.4 +/-    3.11       5.6 +/-    3.11  0.040 / 0.050
G23     151.9          51.9                5.7 +/-    1.07       7.1 +/-    1.07  0.110 / 0.330
G27     63.7           34.8                4.1 +/-    1.05       6.5 +/-    1.05  0.300 / 0.350
G28     231.0          23.0                3.9 +/-    1.88       7.9 +/-    1.88  0.050 / 0.050
G30     295.8          30.8                3.4 +/-    0.77       5.9 +/-    0.77  0.070 / 0.050