PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-14:57:40
G01     44.9           20.7                7.3 +/-    1.12      15.7 +/-    1.12  0.060 / 0.090
G06     176.5          32.2               13.5 +/-    1.81      22.5 +/-    1.81  0.060 / 0.090
G13     245.6          26.3               11.0 +/-    1.79      21.0 +/-    1.79  0.210 / 0.350
G15     279.3          14.1                7.1 +/-    1.22      18.0 +/-    1.22  0.210 / 0.280
G17     354.6          73.9               11.2 +/-    0.69      11.6 +/-    0.69  0.080 / 0.230
G19     263.7          67.3               10.8 +/-    0.96      11.6 +/-    0.96  0.100 / 0.220
G24     318.8          12.4                5.6 +/-    2.18      14.8 +/-    2.18  0.030 / 0.030
G28     63.2           49.7               10.4 +/-    0.94      13.1 +/-    0.94  0.040 / 0.030
G30     152.8          36.0               11.1 +/-    1.16      17.3 +/-    1.16  0.060 / 0.150