PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/23-10:57:50
G07     355.7          64.1                1.1 +/-    0.51       1.2 +/-    0.51  0.040 / 0.050
G08     78.6           51.1                3.0 +/-    0.34       3.8 +/-    0.34  0.040 / 0.040
G09     178.2          60.0                4.2 +/-    1.15       4.7 +/-    1.15  0.060 / 0.090
G11     136.8          19.3                2.8 +/-    2.43       6.3 +/-    2.43  0.070 / 0.110
G23     158.7          33.1                4.8 +/-    1.14       7.8 +/-    1.14  0.060 / 0.090
G27     46.3           24.7                2.8 +/-    1.70       5.6 +/-    1.70  0.060 / 0.100
G28     246.4          37.5                4.2 +/-    1.15       6.4 +/-    1.15  0.110 / 0.350
G30     308.8          40.1                2.1 +/-    0.94       3.0 +/-    0.94  0.130 / 0.330