PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-19:27:50
G01     105.7          25.7               11.9 +/-    1.30      22.8 +/-    1.30  0.030 / 0.040
G07     111.6          51.5               12.1 +/-    1.08      15.0 +/-    1.08  0.030 / 0.050
G08     41.6           18.9                9.5 +/-    2.12      21.6 +/-    2.12  0.080 / 0.190
G09     175.3          14.1               13.8 +/-    1.60      35.1 +/-    1.60  0.090 / 0.180
G11     85.8           42.9               11.3 +/-    0.85      15.6 +/-    0.85  0.150 / 0.220
G13     308.5          30.0               11.3 +/-    1.04      19.9 +/-    1.04  0.200 / 0.270
G17     205.3          39.4               14.5 +/-    1.16      21.4 +/-    1.16  0.070 / 0.050
G18     77.0           23.8                9.9 +/-    1.50      19.9 +/-    1.50  0.080 / 0.070
G28     310.8          59.4               11.5 +/-    1.09      13.2 +/-    1.09  0.040 / 0.030
G30     36.0           78.8               12.5 +/-    1.14      12.7 +/-    1.14  0.050 / 0.030