PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-17:43:00
G07     315.2          50.3               10.2 +/-    0.96      12.8 +/-    0.96  0.060 / 0.070
G08     124.4          45.5               13.6 +/-    0.93      18.1 +/-    0.93  0.040 / 0.080
G09     259.6          82.7               10.0 +/-    0.93      10.1 +/-    0.93  0.030 / 0.060
G16     43.4           16.5                8.1 +/-    1.65      19.3 +/-    1.65  0.030 / 0.070
G23     148.3          50.7               12.1 +/-    0.88      15.1 +/-    0.88  0.050 / 0.060
G27     68.8           36.2               10.5 +/-    0.44      16.2 +/-    0.44  0.040 / 0.060
G28     228.5          19.4               13.1 +/-    2.86      29.3 +/-    2.86  0.160 / 0.350
G30     292.6          28.2                7.3 +/-    1.09      13.3 +/-    1.09  0.130 / 0.390