PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-16:58:00
G07     10.2           66.3               12.1 +/-    0.67      13.1 +/-    0.67  0.030 / 0.040
G08     77.2           51.5               12.7 +/-    0.60      15.8 +/-    0.60  0.030 / 0.050
G09     183.7          61.7               15.7 +/-    1.40      17.6 +/-    1.40  0.060 / 0.130
G11     136.5          22.1               13.7 +/-    1.26      28.6 +/-    1.26  0.060 / 0.140
G23     158.6          28.8               13.3 +/-    0.82      23.8 +/-    0.82  0.070 / 0.180
G27     46.4           25.5               12.3 +/-    1.28      23.7 +/-    1.28  0.090 / 0.230
G28     245.8          34.5               16.1 +/-    0.86      25.8 +/-    0.86  0.080 / 0.110
G30     313.2          45.3               10.9 +/-    0.86      14.6 +/-    0.86  0.070 / 0.110