PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-14:42:50
G01     85.0           32.7                6.6 +/-    2.28      10.9 +/-    2.28  0.020 / 0.020
G07     129.3          41.7                7.7 +/-    0.63      10.9 +/-    0.63  0.030 / 0.030
G11     63.3           37.4                7.6 +/-    1.31      11.5 +/-    1.31  0.050 / 0.060
G13     289.2          37.2               10.3 +/-    1.89      15.6 +/-    1.89  0.030 / 0.050
G17     218.0          58.0                9.0 +/-    0.91      10.4 +/-    0.91  0.060 / 0.090
G18     59.2           22.7                6.6 +/-    2.61      13.6 +/-    2.61  0.070 / 0.080
G19     216.9          28.2                8.5 +/-    1.66      15.5 +/-    1.66  0.060 / 0.090
G28     357.4          61.4                7.5 +/-    0.91       8.4 +/-    0.91  0.060 / 0.090
G30     115.7          73.7                7.6 +/-    0.29       7.8 +/-    0.29  0.080 / 0.160