PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-11:58:00
G01     265.1          40.8                6.2 +/-    1.74       8.9 +/-    1.74  0.140 / 0.240
G03     317.0          38.1                1.4 +/-    1.22       2.0 +/-    1.22  0.110 / 0.190
G10     131.5          12.9                5.2 +/-    3.13      13.5 +/-    3.13  0.060 / 0.090
G11     246.3          17.7                4.8 +/-    1.19      11.1 +/-    1.19  0.080 / 0.110
G14     47.9           47.4                4.0 +/-    0.34       5.2 +/-    0.34  0.040 / 0.040
G18     227.9          36.0                5.0 +/-    1.30       7.8 +/-    1.30  0.040 / 0.050
G22     313.1          60.1                5.3 +/-    1.69       6.0 +/-    1.69  0.050 / 0.080
G25     48.8           14.9                1.7 +/-    1.19       4.3 +/-    1.19  0.050 / 0.080
G31     50.5           71.3                4.4 +/-    0.42       4.6 +/-    0.42  0.180 / 0.430
G32     64.1           34.5                2.3 +/-    1.03       3.7 +/-    1.03  0.190 / 0.480