PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/15-17:12:30
G07     328.5          57.1               10.9 +/-    0.38      12.8 +/-    0.38  0.030 / 0.040
G08     112.3          48.0               12.5 +/-    0.27      16.1 +/-    0.27  0.040 / 0.040
G09     233.3          82.2               11.0 +/-    0.64      11.1 +/-    0.64  0.060 / 0.060
G16     43.9           17.8                7.2 +/-    3.13      16.7 +/-    3.13  0.070 / 0.060
G23     151.8          51.8               12.5 +/-    0.44      15.5 +/-    0.44  0.030 / 0.020
G27     66.9           36.5                9.9 +/-    0.87      15.3 +/-    0.87  0.030 / 0.020
G28     229.7          18.0               11.1 +/-    2.98      25.6 +/-    2.98  0.210 / 0.280
G30     295.4          30.4                9.8 +/-    0.95      16.9 +/-    0.95  0.180 / 0.310