PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/25-15:58:00
G07     308.1          49.2               11.9 +/-    2.07      15.1 +/-    2.07  0.120 / 0.320
G08     131.3          37.4               11.6 +/-    0.67      17.7 +/-    0.67  0.230 / 0.300
G09     313.5          73.2               12.0 +/-    0.48      12.5 +/-    0.48  0.110 / 0.120
G16     41.9           31.1                9.7 +/-    1.52      16.7 +/-    1.52  0.080 / 0.170
G23     139.7          68.0               12.9 +/-    0.31      13.8 +/-    0.31  0.030 / 0.040
G27     87.1           37.2               12.0 +/-    0.78      18.3 +/-    0.78  0.030 / 0.040
G30     283.3          21.1               13.0 +/-    2.13      27.8 +/-    2.13  0.050 / 0.060