PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-15:12:50
G01     70.4           32.9                8.8 +/-    0.49      14.6 +/-    0.49  0.040 / 0.040
G07     137.6          30.8               11.1 +/-    1.84      19.1 +/-    1.84  0.030 / 0.040
G11     53.1           30.0                7.7 +/-    0.95      13.5 +/-    0.95  0.040 / 0.070
G13     273.8          37.6               11.1 +/-    0.81      16.8 +/-    0.81  0.050 / 0.080
G15     304.6          14.0                6.6 +/-    1.64      16.8 +/-    1.64  0.050 / 0.110
G17     234.0          69.4               12.7 +/-    0.98      13.4 +/-    0.98  0.060 / 0.120
G18     48.5           17.8                7.2 +/-    1.36      16.6 +/-    1.36  0.030 / 0.060
G19     224.2          39.3               13.0 +/-    1.35      19.1 +/-    1.35  0.040 / 0.060
G28     19.9           59.3                9.7 +/-    0.32      11.1 +/-    0.32  0.060 / 0.170
G30     135.9          62.5               12.4 +/-    0.39      13.8 +/-    0.39  0.060 / 0.180