PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/30-16:57:40
G01     38.2           10.7                2.3 +/-   21.36       6.4 +/-   21.36  0.230 / 0.380
G02     200.9          11.3                6.1 +/-   13.23      16.6 +/-   13.23  0.110 / 0.240
G06     172.8          47.2                0.8 +/-   19.03       1.0 +/-   19.03  0.070 / 0.140
G13     233.7          17.5               18.1 +/-   15.26      42.3 +/-   15.26  0.070 / 0.140
G17     18.4           62.9               23.3 +/-   18.00      25.8 +/-   18.00  0.120 / 0.220
G19     308.1          72.2              -32.8 +/-   54.37     -34.2 +/-   54.37  0.110 / 0.210
G28     80.9           43.1                5.3 +/-    7.03       7.4 +/-    7.03  0.250 / 0.190
G30     156.7          22.8                6.6 +/-    7.08      13.6 +/-    7.08  0.100 / 0.310