PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-03:57:30
G01     122.4          15.4                7.4 +/-    2.40      18.1 +/-    2.40  0.040 / 0.060
G07     70.6           67.8                3.8 +/-    0.54       4.0 +/-    0.54  0.030 / 0.060
G08     46.8           34.8                2.4 +/-    0.76       3.7 +/-    0.76  0.030 / 0.040
G09     177.9          30.6                5.4 +/-    1.97       9.3 +/-    1.97  0.030 / 0.040
G11     112.6          37.6                5.3 +/-    0.54       8.0 +/-    0.54  0.040 / 0.060
G13     319.9          15.1               -0.1 +/-    1.60      -0.3 +/-    1.60  0.040 / 0.050
G17     200.7          21.3                5.9 +/-    1.69      12.7 +/-    1.69  0.060 / 0.120
G28     286.9          56.2                4.0 +/-    0.94       4.7 +/-    0.94  0.050 / 0.110
G30     344.3          66.6                2.0 +/-    0.65       2.2 +/-    0.65  0.060 / 0.110