PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/15-20:27:50
G01     111.2          23.3               13.6 +/-    1.74      27.6 +/-    1.74  0.120 / 0.110
G07     99.3           61.7               12.9 +/-    0.85      14.5 +/-    0.85  0.080 / 0.160
G08     43.2           27.7                9.1 +/-    2.09      16.7 +/-    2.09  0.100 / 0.070
G09     176.1          18.1               17.5 +/-    0.59      40.5 +/-    0.59  0.100 / 0.110
G11     97.3           42.7               13.6 +/-    1.14      19.0 +/-    1.14  0.040 / 0.020
G13     312.9          25.5               10.8 +/-    2.14      20.9 +/-    2.14  0.030 / 0.020
G17     205.6          29.2               16.6 +/-    1.08      29.5 +/-    1.08  0.100 / 0.140
G18     85.5           23.6               11.3 +/-    1.78      22.9 +/-    1.78  0.110 / 0.130
G28     310.4          60.3               11.8 +/-    1.08      13.4 +/-    1.08  0.030 / 0.010
G30     15.8           76.2               13.1 +/-    0.77      13.4 +/-    0.77  0.020 / 0.010