PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-03:43:10
G08     307.4          20.2                9.0 +/-    1.48      19.7 +/-    1.48  0.060 / 0.070
G10     331.5          59.8                7.6 +/-    0.49       8.6 +/-    0.49  0.090 / 0.070
G14     218.6          33.4               12.1 +/-    1.47      19.8 +/-    1.47  0.060 / 0.040
G15     46.8           12.9                5.8 +/-    2.03      15.0 +/-    2.03  0.050 / 0.050
G18     36.7           60.2               10.4 +/-    1.00      11.8 +/-    1.00  0.050 / 0.070
G21     134.5          56.6               10.3 +/-    0.46      12.1 +/-    0.46  0.050 / 0.070
G24     74.6           30.5                8.6 +/-    1.06      15.0 +/-    1.06  0.050 / 0.030
G27     271.8          37.4                9.9 +/-    2.17      15.0 +/-    2.17  0.030 / 0.020
G32     224.3          52.5               11.7 +/-    1.90      14.3 +/-    1.90  0.050 / 0.060