PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-18:27:50
G07     12.2           67.8               13.3 +/-    0.54      14.3 +/-    0.54  0.040 / 0.040
G08     68.0           51.2               14.0 +/-    1.08      17.4 +/-    1.08  0.040 / 0.040
G09     180.6          51.1               17.1 +/-    0.96      21.3 +/-    0.96  0.040 / 0.040
G11     132.4          26.5               14.1 +/-    2.16      26.7 +/-    2.16  0.040 / 0.060
G18     115.8          9.6                -6.6 +/-   24.36     -18.6 +/-   24.36  0.090 / 0.090
G23     158.3          16.0               14.9 +/-    1.79      36.3 +/-    1.79  0.080 / 0.090
G27     40.7           17.4               10.6 +/-    2.21      24.8 +/-    2.21  0.170 / 0.400
G28     258.2          45.2               15.2 +/-    2.68      20.4 +/-    2.68  0.030 / 0.030
G30     320.9          51.2               12.8 +/-    0.85      15.9 +/-    0.85  0.040 / 0.040