PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/13-08:27:20
G02     202.7          36.7                5.9 +/-    0.84       9.1 +/-    0.84  0.070 / 0.130
G06     170.8          65.9                6.3 +/-    0.53       6.8 +/-    0.53  0.060 / 0.100
G12     307.6          14.3                2.6 +/-    1.51       6.6 +/-    1.51  0.090 / 0.240
G17     37.6           48.0                3.6 +/-    1.78       4.6 +/-    1.78  0.130 / 0.270
G19     5.8            64.2                3.2 +/-    0.42       3.5 +/-    0.42  0.030 / 0.040
G24     298.7          37.5                1.9 +/-    3.10       2.9 +/-    3.10  0.050 / 0.040
G28     103.6          30.1                6.6 +/-    1.14      11.5 +/-    1.14  0.080 / 0.120