PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-19:57:50
G01     110.0          24.0               13.1 +/-    1.65      26.1 +/-    1.65  0.060 / 0.120
G07     101.6          60.9               12.8 +/-    0.95      14.4 +/-    0.95  0.050 / 0.120
G08     42.9           26.2               10.7 +/-    0.86      20.3 +/-    0.86  0.120 / 0.210
G09     175.8          16.8               16.2 +/-    2.48      38.7 +/-    2.48  0.100 / 0.210
G11     95.2           42.9               13.4 +/-    0.38      18.6 +/-    0.38  0.030 / 0.050
G13     312.0          26.4               12.4 +/-    1.73      23.5 +/-    1.73  0.030 / 0.050
G17     206.0          30.6               17.3 +/-    1.17      30.0 +/-    1.17  0.040 / 0.070
G18     84.1           23.9               11.7 +/-    0.63      23.4 +/-    0.63  0.040 / 0.080
G28     312.8          60.5               13.8 +/-    0.81      15.6 +/-    0.81  0.040 / 0.070
G30     19.2           76.9               13.5 +/-    0.71      13.8 +/-    0.71  0.040 / 0.050