PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-09:12:50
G01     319.9          16.5                5.4 +/-    1.98      13.1 +/-    1.98  0.030 / 0.030
G08     259.7          14.7                6.1 +/-    2.18      15.4 +/-    2.18  0.040 / 0.030
G10     76.4           53.5                5.2 +/-    0.74       6.3 +/-    0.74  0.230 / 0.360
G11     304.8          22.2                6.5 +/-    1.56      13.5 +/-    1.56  0.120 / 0.300
G14     289.8          70.6                6.6 +/-    0.94       6.9 +/-    0.94  0.200 / 0.260
G18     306.0          40.2                7.1 +/-    2.26      10.3 +/-    2.26  0.270 / 0.370
G20     103.3          30.8                6.4 +/-    1.09      10.9 +/-    1.09  0.040 / 0.050
G27     227.1          11.1                6.1 +/-    1.51      16.7 +/-    1.51  0.050 / 0.050
G31     176.8          38.6                5.9 +/-    1.52       8.8 +/-    1.52  0.110 / 0.180
G32     348.5          71.4                5.6 +/-    0.64       5.9 +/-    0.64  0.080 / 0.210