PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-17:12:50
G02     202.7          28.6               11.2 +/-    1.59      20.1 +/-    1.59  0.060 / 0.120
G06     160.7          65.9                8.5 +/-    0.33       9.2 +/-    0.33  0.060 / 0.110
G12     306.2          15.1                7.3 +/-    2.66      18.2 +/-    2.66  0.090 / 0.230
G17     32.0           52.3                9.0 +/-    1.06      11.0 +/-    1.06  0.250 / 0.300
G19     342.5          68.3                7.8 +/-    0.53       8.3 +/-    0.53  0.030 / 0.030
G24     301.3          36.8                9.7 +/-    1.17      14.9 +/-    1.17  0.030 / 0.030
G28     98.2           34.0               10.0 +/-    0.91      16.1 +/-    0.91  0.040 / 0.040