PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-04:57:50
G01     93.9           30.9                4.3 +/-    1.81       7.4 +/-    1.81  0.030 / 0.040
G07     122.4          47.9                5.4 +/-    0.52       7.0 +/-    0.52  0.030 / 0.040
G08     42.2           10.2                1.7 +/-    4.20       4.8 +/-    4.20  0.110 / 0.320
G11     73.6           40.9                3.8 +/-    1.23       5.4 +/-    1.23  0.160 / 0.240
G13     299.4          34.0                2.9 +/-    2.29       4.7 +/-    2.29  0.030 / 0.040
G17     212.3          51.1                6.0 +/-    0.73       7.5 +/-    0.73  0.030 / 0.040
G19     213.1          25.2                5.9 +/-    1.76      11.5 +/-    1.76  0.090 / 0.090
G28     344.3          61.8                2.6 +/-    0.58       2.9 +/-    0.58  0.080 / 0.100
G30     95.6           76.3                4.4 +/-    0.49       4.6 +/-    0.49  0.050 / 0.070