PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/20-03:12:50
G01     117.4          18.9                6.5 +/-    1.86      14.7 +/-    1.86  0.030 / 0.050
G07     88.7           63.5                4.1 +/-    0.79       4.5 +/-    0.79  0.030 / 0.040
G08     43.5           27.4                1.6 +/-    1.75       3.0 +/-    1.75  0.110 / 0.190
G09     175.3          22.6                5.9 +/-    1.53      12.2 +/-    1.53  0.120 / 0.200
G11     101.9          40.8                6.1 +/-    0.37       8.8 +/-    0.37  0.120 / 0.350
G13     316.6          21.3                1.0 +/-    2.60       2.1 +/-    2.60  0.070 / 0.310
G17     200.9          28.9                5.3 +/-    1.71       9.5 +/-    1.71  0.040 / 0.070
G18     88.6           21.1                4.8 +/-    1.09      10.3 +/-    1.09  0.050 / 0.050
G28     292.4          56.7                3.8 +/-    1.22       4.4 +/-    1.22  0.030 / 0.040
G30     346.6          69.3                1.9 +/-    0.95       2.0 +/-    0.95  0.030 / 0.030