PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/15-01:57:30
G01     66.8           32.3                4.5 +/-    1.62       7.5 +/-    1.62  0.040 / 0.050
G07     139.4          28.0                5.5 +/-    1.06      10.0 +/-    1.06  0.040 / 0.040
G11     53.0           30.4                4.2 +/-    1.52       7.3 +/-    1.52  0.030 / 0.040
G13     271.0          36.7                4.1 +/-    2.02       6.3 +/-    2.02  0.030 / 0.030
G15     298.7          16.3                3.9 +/-    2.42       9.4 +/-    2.42  0.050 / 0.070
G17     239.9          70.5                5.2 +/-    0.42       5.4 +/-    0.42  0.050 / 0.070
G19     227.2          45.7                5.3 +/-    1.84       7.0 +/-    1.84  0.080 / 0.100
G28     26.9           58.1                7.2 +/-    1.18       8.3 +/-    1.18  0.060 / 0.090
G30     138.3          53.5                8.0 +/-    0.68       9.7 +/-    0.68  0.080 / 0.150