PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-16:13:10
G01     61.5           30.7                9.8 +/-    1.20      16.9 +/-    1.20  0.090 / 0.130
G06     180.3          14.0               12.6 +/-    2.51      32.0 +/-    2.51  0.070 / 0.130
G07     141.2          20.3               10.1 +/-    0.94      22.0 +/-    0.94  0.030 / 0.040
G11     48.1           22.0                7.7 +/-    1.39      16.3 +/-    1.39  0.040 / 0.050
G13     266.7          35.4               11.8 +/-    1.44      18.6 +/-    1.44  0.030 / 0.030
G15     298.9          15.1                6.0 +/-    1.81      14.9 +/-    1.81  0.020 / 0.040
G17     259.9          77.8               11.6 +/-    0.46      11.8 +/-    0.46  0.090 / 0.280
G19     231.6          51.5               13.7 +/-    1.46      17.0 +/-    1.46  0.110 / 0.340
G28     33.2           57.0                9.9 +/-    0.44      11.5 +/-    0.44  0.050 / 0.090
G30     142.1          56.5               12.1 +/-    0.89      14.2 +/-    0.89  0.050 / 0.090