PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-01:27:30
G02     274.5          81.4                9.0 +/-    0.84       9.1 +/-    0.84  0.040 / 0.040
G05     168.1          22.9               12.2 +/-    1.66      25.0 +/-    1.66  0.050 / 0.040
G06     39.9           51.9                7.0 +/-    0.44       8.6 +/-    0.44  0.040 / 0.110
G12     320.8          58.3                9.0 +/-    1.62      10.4 +/-    1.62  0.040 / 0.130
G17     74.1           22.6                6.5 +/-    0.87      13.4 +/-    0.87  0.110 / 0.240
G19     63.0           35.4                8.1 +/-    0.41      12.8 +/-    0.41  0.110 / 0.200
G24     238.9          30.9               13.4 +/-    1.18      23.1 +/-    1.18  0.110 / 0.130
G25     317.6          17.1                8.3 +/-    1.94      19.7 +/-    1.94  0.130 / 0.150