PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/11-17:27:40
G07     327.4          56.7               13.1 +/-    0.72      15.4 +/-    0.72  0.030 / 0.030
G08     113.1          47.7               15.0 +/-    0.52      19.5 +/-    0.52  0.030 / 0.030
G09     238.0          82.5               14.4 +/-    0.64      14.6 +/-    0.64  0.040 / 0.040
G16     43.7           18.5               10.2 +/-    3.14      23.4 +/-    3.14  0.040 / 0.040
G23     151.5          52.6               14.8 +/-    0.38      18.1 +/-    0.38  0.300 / 0.250
G27     67.7           36.7               13.6 +/-    0.86      21.0 +/-    0.86  0.180 / 0.330
G28     229.4          17.5               13.1 +/-    3.06      30.7 +/-    3.06  0.070 / 0.050
G30     294.8          29.9               12.8 +/-    1.57      22.5 +/-    1.57  0.080 / 0.060