PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/23-21:13:00
G10     255.8          30.0               16.8 +/-    1.66      29.5 +/-    1.66  0.110 / 0.270
G13     49.6           27.8               11.3 +/-    1.26      20.7 +/-    1.26  0.140 / 0.250
G15     75.2           55.6               15.2 +/-    0.93      18.0 +/-    0.93  0.060 / 0.050
G16     293.5          13.6               14.9 +/-    1.00      38.4 +/-    1.00  0.050 / 0.050
G18     279.1          59.6               15.6 +/-    0.99      17.7 +/-    0.99  0.090 / 0.320
G20     47.0           43.4               13.8 +/-    0.68      19.1 +/-    0.68  0.080 / 0.340
G21     344.4          65.5               13.0 +/-    0.89      14.1 +/-    0.89  0.040 / 0.080
G26     266.1          12.9               16.6 +/-    3.64      43.4 +/-    3.64  0.040 / 0.060
G27     321.7          11.3                2.3 +/-   38.17       6.1 +/-   38.17  0.190 / 0.380
G29     164.4          38.8               17.1 +/-    1.28      25.3 +/-    1.28  0.130 / 0.280