PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-01:13:00
G02     242.1          77.0                9.7 +/-    0.34       9.9 +/-    0.34  0.050 / 0.040
G05     170.8          16.8               13.9 +/-    1.54      33.1 +/-    1.54  0.060 / 0.030
G06     40.7           58.7                9.0 +/-    0.46      10.4 +/-    0.46  0.050 / 0.040
G12     321.5          51.3                9.9 +/-    0.64      12.3 +/-    0.64  0.050 / 0.040
G17     68.4           26.6                8.7 +/-    1.73      16.3 +/-    1.73  0.180 / 0.280
G19     56.2           39.6                8.9 +/-    1.59      13.1 +/-    1.59  0.130 / 0.260
G24     245.8          35.0               12.4 +/-    2.00      19.6 +/-    2.00  0.250 / 0.200
G25     316.6          11.2               -8.2 +/-   30.28     -22.2 +/-   30.28  0.400 / 0.390