PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-17:27:40
G02     204.0          33.6               12.7 +/-    1.73      20.7 +/-    1.73  0.090 / 0.090
G06     153.3          70.9               11.6 +/-    0.90      12.2 +/-    0.90  0.100 / 0.100
G12     308.9          18.8                8.0 +/-    2.31      18.1 +/-    2.31  0.080 / 0.180
G17     36.6           48.7                7.8 +/-    1.65      10.1 +/-    1.65  0.070 / 0.170
G19     355.2          66.1                8.7 +/-    0.51       9.4 +/-    0.51  0.040 / 0.020
G24     296.1          39.3                8.2 +/-    5.11      12.0 +/-    5.11  0.040 / 0.030
G28     103.0          30.9               10.2 +/-    0.81      17.6 +/-    0.81  0.050 / 0.040