PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-18:12:40
G07     50.4           67.7               12.7 +/-    1.00      13.6 +/-    1.00  0.030 / 0.030
G08     55.8           43.7               12.5 +/-    1.21      17.2 +/-    1.21  0.040 / 0.030
G09     179.8          44.5               14.7 +/-    0.73      20.0 +/-    0.73  0.150 / 0.130
G11     123.5          32.2               13.0 +/-    0.72      21.8 +/-    0.72  0.150 / 0.090
G18     107.4          13.4               10.8 +/-    2.18      28.0 +/-    2.18  0.040 / 0.030
G23     160.5          13.9               11.7 +/-    2.09      29.8 +/-    2.09  0.040 / 0.040
G27     39.0           13.9                8.8 +/-    2.53      22.5 +/-    2.53  0.230 / 0.260
G28     262.7          45.4               14.7 +/-    2.68      19.7 +/-    2.68  0.140 / 0.290
G30     327.5          56.7               11.8 +/-    0.67      13.8 +/-    0.67  0.060 / 0.050