PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-01:43:00
G01     63.9           31.7                5.2 +/-    0.64       8.8 +/-    0.64  0.030 / 0.030
G06     182.3          10.5              -11.9 +/-   35.62     -32.8 +/-   35.62  0.030 / 0.030
G07     140.7          25.8                8.0 +/-    0.80      15.4 +/-    0.80  0.220 / 0.320
G11     51.5           28.7                3.6 +/-    0.70       6.4 +/-    0.70  0.250 / 0.370
G13     267.8          36.1                6.8 +/-    1.24      10.5 +/-    1.24  0.030 / 0.050
G15     296.4          16.6                4.4 +/-    1.71      10.4 +/-    1.71  0.030 / 0.050
G17     245.7          72.3                7.5 +/-    0.87       7.9 +/-    0.87  0.050 / 0.080
G19     229.4          47.9                8.4 +/-    2.35      10.9 +/-    2.35  0.060 / 0.080
G28     31.1           57.4                4.6 +/-    1.01       5.3 +/-    1.01  0.060 / 0.130
G30     140.3          51.4                7.9 +/-    1.10       9.8 +/-    1.10  0.060 / 0.130