PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-12:12:50
G01     236.8          27.3                7.7 +/-    1.10      14.2 +/-    1.10  0.040 / 0.040
G03     308.0          61.5                6.1 +/-    0.82       6.8 +/-    0.82  0.040 / 0.040
G14     73.5           32.3                6.1 +/-    2.30      10.1 +/-    2.30  0.110 / 0.110
G16     158.9          28.7                3.3 +/-    1.42       6.0 +/-    1.42  0.120 / 0.120
G18     210.1          16.3                5.8 +/-    1.43      14.1 +/-    1.43  0.030 / 0.030
G22     254.3          77.2                7.7 +/-    0.63       7.9 +/-    0.63  0.040 / 0.030
G23     296.9          28.2                5.9 +/-    1.27      10.6 +/-    1.27  0.060 / 0.130
G26     124.8          47.7                7.8 +/-    1.00      10.1 +/-    1.00  0.080 / 0.120
G31     41.4           45.6                4.4 +/-    1.06       5.9 +/-    1.06  0.090 / 0.140
G32     86.2           18.5                4.5 +/-    2.85      10.2 +/-    2.85  0.100 / 0.140