PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/22-07:42:30
G02     201.7          33.1                5.6 +/-    1.18       9.1 +/-    1.18  0.060 / 0.120
G06     173.5          61.6                5.9 +/-    0.46       6.7 +/-    0.46  0.070 / 0.110
G12     305.6          11.6               -1.1 +/-   14.69      -3.0 +/-   14.69  0.030 / 0.060
G17     33.9           51.0                2.3 +/-    1.05       2.9 +/-    1.05  0.030 / 0.040
G19     357.7          66.5                1.7 +/-    0.46       1.8 +/-    0.46  0.170 / 0.170
G24     302.4          35.5                2.9 +/-    1.70       4.6 +/-    1.70  0.230 / 0.240
G28     100.0          32.5                3.9 +/-    1.20       6.5 +/-    1.20  0.040 / 0.030