PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-18:43:10
G01     120.6          16.1               13.9 +/-    2.25      33.7 +/-    2.25  0.030 / 0.040
G07     85.1           62.6               13.1 +/-    0.37      14.5 +/-    0.37  0.030 / 0.040
G08     45.7           32.8                9.8 +/-    1.18      16.2 +/-    1.18  0.060 / 0.100
G09     177.9          29.7               14.7 +/-    1.49      25.9 +/-    1.49  0.080 / 0.070
G11     108.1          39.6               13.7 +/-    1.17      20.1 +/-    1.17  0.040 / 0.040
G13     318.4          18.4               11.4 +/-    3.21      26.1 +/-    3.21  0.030 / 0.030
G17     200.4          22.7               16.0 +/-    2.03      33.0 +/-    2.03  0.140 / 0.350
G18     94.3           19.8               11.7 +/-    2.17      25.8 +/-    2.17  0.200 / 0.280
G28     282.3          53.4               16.0 +/-    1.92      19.4 +/-    1.92  0.100 / 0.120
G30     345.8          68.0               12.4 +/-    0.75      13.2 +/-    0.75  0.090 / 0.120