PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/18-09:57:40
G01     74.4           32.4                4.5 +/-    0.62       7.5 +/-    0.62  0.040 / 0.030
G07     134.3          33.4                7.2 +/-    0.97      11.7 +/-    0.97  0.030 / 0.040
G11     57.5           35.5                3.3 +/-    0.73       5.2 +/-    0.73  0.050 / 0.080
G13     278.9          39.0                5.1 +/-    1.57       7.6 +/-    1.57  0.040 / 0.090
G15     306.7          13.8                2.9 +/-    1.50       7.4 +/-    1.50  0.040 / 0.040
G17     224.4          62.7                8.9 +/-    1.36       9.9 +/-    1.36  0.030 / 0.050
G18     51.9           20.0                3.2 +/-    1.27       7.1 +/-    1.27  0.080 / 0.110
G19     220.0          39.9                8.3 +/-    0.59      12.1 +/-    0.59  0.100 / 0.130
G28     356.1          61.5                4.9 +/-    1.14       5.5 +/-    1.14  0.070 / 0.100
G30     130.2          68.0                7.0 +/-    0.65       7.5 +/-    0.65  0.060 / 0.070