PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-04:57:30
G01     93.9           30.9                4.9 +/-    0.46       8.5 +/-    0.46  0.040 / 0.050
G07     122.4          47.9                4.4 +/-    0.64       5.7 +/-    0.64  0.040 / 0.060
G08     42.2           10.2                2.8 +/-    1.65       7.7 +/-    1.65  0.030 / 0.050
G11     73.6           40.9                4.3 +/-    1.16       6.1 +/-    1.16  0.030 / 0.050
G13     299.4          34.0                5.1 +/-    1.73       8.2 +/-    1.73  0.040 / 0.050
G17     212.3          51.1                6.3 +/-    0.91       7.8 +/-    0.91  0.030 / 0.060
G19     213.1          25.2                8.3 +/-    1.13      16.1 +/-    1.13  0.170 / 0.380
G28     344.3          61.8                2.6 +/-    0.65       3.0 +/-    0.65  0.100 / 0.400
G30     95.6           76.3                5.0 +/-    1.06       5.1 +/-    1.06  0.080 / 0.110