PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/16-19:42:40
G01     68.2           32.6               11.8 +/-    0.91      19.6 +/-    0.91  0.110 / 0.360
G07     138.7          29.4               13.5 +/-    1.28      24.0 +/-    1.28  0.110 / 0.420
G11     52.7           29.9               11.7 +/-    1.01      20.4 +/-    1.01  0.030 / 0.040
G13     271.8          37.1               13.3 +/-    0.99      20.3 +/-    0.99  0.030 / 0.040
G15     301.0          15.4                7.5 +/-    2.26      18.5 +/-    2.26  0.080 / 0.160
G17     236.0          67.6               13.2 +/-    0.43      14.2 +/-    0.43  0.060 / 0.150
G18     47.6           17.3                9.3 +/-    1.13      21.9 +/-    1.13  0.050 / 0.080
G19     225.9          42.6               15.0 +/-    0.85      20.9 +/-    0.85  0.050 / 0.070
G28     23.9           58.7               11.9 +/-    0.23      13.7 +/-    0.23  0.030 / 0.050
G30     137.7          58.7               12.4 +/-    0.66      14.2 +/-    0.66  0.030 / 0.060