PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-08:28:00
G01     224.8          15.8                4.7 +/-    2.11      11.6 +/-    2.11  0.100 / 0.180
G03     287.1          66.4                8.3 +/-    3.97       9.0 +/-    3.97  0.110 / 0.220
G09     295.7          10.5              -10.7 +/-   25.37     -29.4 +/-   25.37  0.120 / 0.290
G14     89.0           21.6                2.0 +/-    1.62       4.2 +/-    1.62  0.110 / 0.270
G16     146.9          46.5                6.7 +/-    0.52       8.9 +/-    0.52  0.040 / 0.040
G22     209.7          69.3                4.0 +/-    0.96       4.2 +/-    0.96  0.040 / 0.040
G23     307.7          37.2                2.9 +/-    1.03       4.4 +/-    1.03  0.040 / 0.070
G26     96.9           54.9              -80.1 +/-   78.14     -95.5 +/-   78.14  0.030 / 0.060
G31     45.5           31.1                2.7 +/-    1.10       4.6 +/-    1.10  0.050 / 0.100