PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/20-00:27:50
G01     72.5           32.9                7.1 +/-    1.19      11.7 +/-    1.19  0.070 / 0.100
G07     136.2          28.5               10.3 +/-    1.02      18.6 +/-    1.02  0.060 / 0.080
G11     53.6           30.8                6.5 +/-    1.40      11.2 +/-    1.40  0.050 / 0.070
G13     275.9          38.3                8.8 +/-    1.08      13.1 +/-    1.08  0.050 / 0.070
G15     303.8          15.0                4.0 +/-    1.07      10.0 +/-    1.07  0.050 / 0.050
G17     230.4          70.1                8.9 +/-    0.51       9.5 +/-    0.51  0.040 / 0.040
G18     47.4           16.6                5.6 +/-    0.74      13.5 +/-    0.74  0.110 / 0.080
G19     222.4          39.7                9.7 +/-    1.97      14.2 +/-    1.97  0.110 / 0.090
G28     10.0           60.7                7.2 +/-    1.61       8.2 +/-    1.61  0.080 / 0.230
G30     133.8          63.7                9.2 +/-    0.92      10.2 +/-    0.92  0.090 / 0.270