PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/20-06:57:40
G02     203.1          33.5                5.6 +/-    1.93       9.2 +/-    1.93  0.050 / 0.080
G06     164.6          66.9                7.0 +/-    0.47       7.6 +/-    0.47  0.060 / 0.080
G12     306.6          14.0                2.1 +/-    1.63       5.4 +/-    1.63  0.030 / 0.040
G17     37.6           47.5                2.8 +/-    0.40       3.7 +/-    0.40  0.040 / 0.040
G19     353.7          66.6                2.3 +/-    0.90       2.5 +/-    0.90  0.120 / 0.240
G24     294.8          40.8                3.5 +/-    0.76       5.0 +/-    0.76  0.090 / 0.240
G28     100.4          33.7                5.8 +/-    1.35       9.5 +/-    1.35  0.080 / 0.120