PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/16-19:27:40
G07     31.0           69.5               12.1 +/-    0.48      12.8 +/-    0.48  0.050 / 0.020
G08     59.5           47.9               11.4 +/-    0.59      14.8 +/-    0.59  0.050 / 0.020
G09     179.6          43.8               13.1 +/-    0.56      18.0 +/-    0.56  0.240 / 0.530
G11     126.8          30.9               14.4 +/-    1.72      24.7 +/-    1.72  0.090 / 0.500
G18     110.2          13.2               13.6 +/-    2.50      35.3 +/-    2.50  0.150 / 0.350
G23     159.0          10.1               14.4 +/-    4.04      40.0 +/-    4.04  0.170 / 0.340
G27     38.3           12.0                8.8 +/-    1.89      23.5 +/-    1.89  0.030 / 0.010
G28     267.1          49.6               13.0 +/-    4.23      16.4 +/-    4.23  0.040 / 0.020
G30     328.2          56.8               11.1 +/-    0.40      13.0 +/-    0.40  0.030 / 0.010