PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/20-01:43:10
G07     346.2          62.3                2.7 +/-    0.66       3.1 +/-    0.66  0.040 / 0.040
G08     85.1           51.3                4.5 +/-    0.48       5.6 +/-    0.48  0.040 / 0.050
G09     181.4          66.0                4.0 +/-    0.69       4.4 +/-    0.69  0.070 / 0.090
G11     140.5          17.6                5.9 +/-    1.55      13.8 +/-    1.55  0.100 / 0.120
G23     158.1          38.2                5.6 +/-    1.00       8.3 +/-    1.00  0.070 / 0.120
G27     52.2           30.7                4.0 +/-    1.23       6.9 +/-    1.23  0.070 / 0.220
G28     240.9          31.7                4.4 +/-    2.18       7.4 +/-    2.18  0.060 / 0.080
G30     305.5          37.7                2.7 +/-    0.84       4.0 +/-    0.84  0.050 / 0.090