PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/27-17:12:30
G07     12.9           66.6                8.5 +/-    0.57       9.1 +/-    0.57  0.040 / 0.040
G08     75.0           51.2                8.9 +/-    0.73      11.1 +/-    0.73  0.030 / 0.040
G09     183.2          60.3               12.2 +/-    1.43      13.8 +/-    1.43  0.090 / 0.150
G11     135.5          22.9               10.6 +/-    1.54      21.7 +/-    1.54  0.070 / 0.120
G23     158.9          27.7               10.6 +/-    1.51      19.5 +/-    1.51  0.090 / 0.230
G27     45.6           24.7                7.9 +/-    1.02      15.6 +/-    1.02  0.090 / 0.260
G28     247.0          35.5               10.7 +/-    2.24      16.8 +/-    2.24  0.060 / 0.120
G30     314.2          46.1                6.9 +/-    0.98       9.2 +/-    0.98  0.070 / 0.100