PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/18-16:58:00
G07     7.7            67.1               10.9 +/-    0.61      11.7 +/-    0.61  0.050 / 0.050
G08     69.5           51.2               11.7 +/-    0.67      14.5 +/-    0.67  0.040 / 0.040
G09     180.4          52.7               14.8 +/-    0.63      18.0 +/-    0.63  0.050 / 0.050
G11     133.3          25.4               12.9 +/-    3.38      25.0 +/-    3.38  0.040 / 0.050
G23     158.3          18.2               12.7 +/-    1.43      29.2 +/-    1.43  0.110 / 0.130
G27     41.6           19.0               10.5 +/-    3.38      23.6 +/-    3.38  0.130 / 0.110
G28     255.9          43.9               12.4 +/-    3.81      17.0 +/-    3.81  0.030 / 0.040
G30     318.5          49.2               10.0 +/-    0.42      12.8 +/-    0.42  0.030 / 0.040