PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/23-11:57:40
G01     124.5          13.6                3.1 +/-    1.74       8.0 +/-    1.74  0.070 / 0.110
G07     67.7           67.1                3.3 +/-    0.64       3.5 +/-    0.64  0.070 / 0.090
G08     47.8           35.4                3.3 +/-    1.69       5.2 +/-    1.69  0.310 / 0.440
G09     175.6          30.4                4.7 +/-    1.45       8.1 +/-    1.45  0.100 / 0.250
G11     112.3          35.6                4.6 +/-    0.98       7.3 +/-    0.98  0.040 / 0.030
G13     321.1          12.1                1.7 +/-    5.17       4.6 +/-    5.17  0.030 / 0.030
G17     199.6          20.1                3.7 +/-    1.74       8.1 +/-    1.74  0.160 / 0.240
G28     281.5          54.4                1.5 +/-    2.58       1.9 +/-    2.58  0.190 / 0.220
G30     334.1          61.2                1.4 +/-    0.60       1.6 +/-    0.60  0.090 / 0.130