PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/20-17:42:50
G02     227.1          68.1                9.6 +/-    0.93      10.3 +/-    0.93  0.050 / 0.060
G06     43.8           65.2               11.2 +/-    0.62      12.2 +/-    0.62  0.050 / 0.050
G12     320.2          43.5                7.9 +/-    0.67      10.9 +/-    0.67  0.060 / 0.100
G17     63.0           28.9                7.6 +/-    1.26      13.6 +/-    1.26  0.050 / 0.120
G19     50.5           41.8                8.5 +/-    0.80      12.0 +/-    0.80  0.230 / 0.440
G24     253.8          38.1               10.7 +/-    1.62      16.0 +/-    1.62  0.320 / 0.450
G28     127.0          11.8                8.3 +/-    3.96      22.2 +/-    3.96  0.050 / 0.080