PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/20-02:42:50
G07     53.8           68.7                5.3 +/-    0.55       5.6 +/-    0.55  0.030 / 0.030
G08     50.4           38.6                4.1 +/-    0.66       6.2 +/-    0.66  0.030 / 0.030
G09     176.7          36.4                6.8 +/-    1.28      10.5 +/-    1.28  0.100 / 0.250
G11     118.1          34.8                6.9 +/-    0.85      10.9 +/-    0.85  0.100 / 0.260
G17     198.5          15.4                5.8 +/-    3.95      14.2 +/-    3.95  0.250 / 0.260
G18     101.9          15.7                7.0 +/-    2.49      17.1 +/-    2.49  0.130 / 0.170
G23     161.5          11.3                6.1 +/-    1.64      16.6 +/-    1.64  0.070 / 0.080
G27     38.0           11.0                4.3 +/-    2.80      11.9 +/-    2.80  0.100 / 0.080
G28     270.9          50.1                4.4 +/-    1.90       5.5 +/-    1.90  0.290 / 0.380
G30     329.0          58.0                4.1 +/-    0.27       4.7 +/-    0.27  0.300 / 0.430