PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-15:58:00
G01     69.8           32.5                9.5 +/-    0.80      15.9 +/-    0.80  0.070 / 0.110
G07     137.5          26.9               10.5 +/-    1.92      19.6 +/-    1.92  0.090 / 0.130
G11     52.2           27.4                7.7 +/-    1.73      14.2 +/-    1.73  0.040 / 0.040
G13     276.0          36.8               11.6 +/-    1.55      17.9 +/-    1.55  0.040 / 0.040
G15     305.5          13.8                7.9 +/-    1.50      20.1 +/-    1.50  0.030 / 0.040
G17     236.3          72.3               11.3 +/-    0.89      11.8 +/-    0.89  0.020 / 0.040
G19     224.8          44.6               14.3 +/-    2.03      19.4 +/-    2.03  0.100 / 0.200
G28     20.5           59.0               11.3 +/-    0.49      12.9 +/-    0.49  0.130 / 0.260
G30     134.9          63.9               10.7 +/-    1.31      11.8 +/-    1.31  0.060 / 0.090