PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/13-16:12:30
G07     317.5          51.4               12.1 +/-    1.52      15.0 +/-    1.52  0.040 / 0.060
G08     120.2          47.0               14.9 +/-    1.05      19.6 +/-    1.05  0.040 / 0.060
G09     238.8          82.8               12.6 +/-    0.81      12.7 +/-    0.81  0.070 / 0.130
G16     43.9           14.5                9.6 +/-    1.11      24.2 +/-    1.11  0.070 / 0.160
G23     149.3          48.6               13.5 +/-    0.88      17.3 +/-    0.88  0.080 / 0.220
G27     66.7           35.9               11.7 +/-    0.63      18.3 +/-    0.63  0.080 / 0.210
G28     229.6          20.8               14.0 +/-    2.22      30.1 +/-    2.22  0.150 / 0.330
G30     293.7          28.7                8.9 +/-    1.77      16.0 +/-    1.77  0.140 / 0.300