PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-09:43:10
G03     246.0812       67.8886          3.9639 +/-  0.3940    4.2432 +/-  0.3940  0.100 / 0.160
G09     303.9948       19.8189          1.8048 +/-  1.2847    3.9887 +/-  1.2847  0.080 / 0.170
G14     100.4235       12.8731          2.1196 +/-  2.1959    5.5465 +/-  2.1959  0.060 / 0.060
G16     128.4556       59.1978          6.1531 +/-  0.4133    7.0379 +/-  0.4133  0.050 / 0.060
G22     192.7667       55.0966          3.8057 +/-  0.5045    4.5300 +/-  0.5045  0.220 / 0.370
G23     318.2066       47.8005          3.1554 +/-  1.2662    4.0922 +/-  1.2662  0.130 / 0.290
G26     70.7103        52.5840          3.8759 +/-  0.6802    4.7413 +/-  0.6802  0.050 / 0.050
G31     52.0004        19.6380          1.9398 +/-  2.6082    4.3062 +/-  2.6082  0.050 / 0.050