PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/30-15:27:40
G02     50.4           40.3                9.0 +/-    0.58      13.0 +/-    0.58  0.030 / 0.030
G05     90.9           70.2                9.7 +/-    0.55      10.2 +/-    0.55  0.030 / 0.030
G12     189.1          46.7               13.1 +/-    2.27      17.2 +/-    2.27  0.040 / 0.060
G20     203.0          45.8               14.2 +/-    1.47      19.0 +/-    1.47  0.030 / 0.070
G21     262.6          12.4               10.5 +/-    2.03      27.7 +/-    2.03  0.290 / 0.490
G25     255.9          58.1               13.0 +/-    0.75      15.0 +/-    0.75  0.220 / 0.530
G29     324.7          49.2               10.0 +/-    1.46      12.7 +/-    1.46  0.070 / 0.080