PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/20-10:12:50
G01     62.0           30.5                3.5 +/-    0.72       6.0 +/-    0.72  0.030 / 0.040
G07     140.3          23.6                4.3 +/-    1.83       8.7 +/-    1.83  0.030 / 0.040
G11     50.1           28.0                2.3 +/-    0.94       4.3 +/-    0.94  0.080 / 0.150
G13     264.9          37.3                6.7 +/-    2.27      10.3 +/-    2.27  0.080 / 0.170
G15     297.1          15.9                4.4 +/-    1.93      10.7 +/-    1.93  0.040 / 0.030
G17     243.6          72.4                6.4 +/-    0.51       6.7 +/-    0.51  0.030 / 0.040
G18     43.7           14.5                1.9 +/-    1.81       4.7 +/-    1.81  0.060 / 0.120
G19     228.7          49.9                7.4 +/-    0.75       9.4 +/-    0.75  0.080 / 0.110
G28     16.8           60.4                4.7 +/-    0.59       5.3 +/-    0.59  0.040 / 0.050
G30     141.9          57.4                5.4 +/-    0.71       6.3 +/-    0.71  0.040 / 0.060