PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-16:57:50
G08     316.3          14.8                4.3 +/-    1.31      10.7 +/-    1.31  0.050 / 0.080
G10     315.8          56.7                4.4 +/-    0.65       5.2 +/-    0.65  0.060 / 0.100
G14     214.4          23.1               11.8 +/-    1.26      24.1 +/-    1.26  0.040 / 0.040
G15     45.6           16.3                5.1 +/-    0.63      12.4 +/-    0.63  0.030 / 0.050
G18     27.8           61.7                7.2 +/-    0.46       8.1 +/-    0.46  0.060 / 0.090
G20     79.2           12.8                6.3 +/-    1.56      16.5 +/-    1.56  0.070 / 0.120
G21     125.5          59.2                8.7 +/-    0.73      10.0 +/-    0.73  0.180 / 0.410
G24     85.0           30.0                6.7 +/-    0.55      11.7 +/-    0.55  0.130 / 0.390
G27     284.2          38.0                6.5 +/-    1.03       9.8 +/-    1.03  0.090 / 0.310
G32     217.3          43.3                9.8 +/-    1.42      13.5 +/-    1.42  0.100 / 0.300