PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-04:12:50
G08     269.3          19.0                9.1 +/-    1.33      20.5 +/-    1.33  0.100 / 0.240
G10     57.2           59.2                8.4 +/-    0.86       9.7 +/-    0.86  0.100 / 0.260
G14     259.5          62.8                9.4 +/-    0.62      10.4 +/-    0.62  0.050 / 0.070
G18     313.5          29.8                9.5 +/-    2.25      16.7 +/-    2.25  0.050 / 0.070
G20     80.8           53.7               11.9 +/-    0.37      14.4 +/-    0.37  0.090 / 0.340
G21     154.6          18.3                8.6 +/-    3.67      19.8 +/-    3.67  0.090 / 0.320
G24     40.0           10.5                7.4 +/-    1.94      20.5 +/-    1.94  0.190 / 0.300
G27     233.5          17.4               10.1 +/-    2.13      23.8 +/-    2.13  0.150 / 0.310
G31     177.1          29.9               12.5 +/-    1.09      22.0 +/-    1.09  0.030 / 0.030
G32     338.7          74.8                9.3 +/-    0.56       9.6 +/-    0.56  0.030 / 0.040