PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/20-16:12:30
G02     216.1          56.5                9.1 +/-    0.93      10.7 +/-    0.93  0.070 / 0.080
G06     56.8           72.6                8.9 +/-    1.12       9.3 +/-    1.12  0.060 / 0.080
G12     319.9          40.2                8.4 +/-    1.31      12.2 +/-    1.31  0.050 / 0.070
G17     57.8           31.4                7.3 +/-    1.26      12.5 +/-    1.26  0.040 / 0.080
G19     34.2           52.3                8.0 +/-    0.39       9.8 +/-    0.39  0.040 / 0.040
G24     263.9          42.1                7.4 +/-    1.35      10.4 +/-    1.35  0.040 / 0.040
G28     122.0          14.4                8.5 +/-    2.17      21.4 +/-    2.17  0.030 / 0.060