PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-18:57:40
G01     84.3           32.9               11.1 +/-    1.00      18.3 +/-    1.00  0.160 / 0.310
G07     129.8          41.5               12.2 +/-    0.92      17.3 +/-    0.92  0.140 / 0.320
G11     64.0           38.1                9.1 +/-    1.35      13.7 +/-    1.35  0.030 / 0.030
G13     288.8          37.1               14.3 +/-    1.65      21.9 +/-    1.65  0.030 / 0.030
G15     312.2          11.7               10.1 +/-    1.67      27.1 +/-    1.67  0.080 / 0.170
G17     219.1          55.4               13.9 +/-    1.11      16.5 +/-    1.11  0.090 / 0.200
G18     59.1           22.8                9.4 +/-    1.46      19.3 +/-    1.46  0.040 / 0.060
G19     217.2          30.2               14.6 +/-    2.77      25.4 +/-    2.77  0.030 / 0.060
G28     359.3          61.3                9.6 +/-    1.25      10.8 +/-    1.25  0.040 / 0.050
G30     118.7          71.4               12.4 +/-    0.63      13.0 +/-    0.63  0.040 / 0.040