PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/05/13-20:57:30
G02     202.0          31.2               19.8 +/-    1.23      33.8 +/-    1.23  0.050 / 0.090
G06     167.0          63.7               16.6 +/-    0.47      18.3 +/-    0.47  0.070 / 0.080
G17     32.4           51.9               14.0 +/-    1.58      17.3 +/-    1.58  0.080 / 0.080
G19     354.1          67.2               14.1 +/-    0.94      15.1 +/-    0.94  0.080 / 0.110
G24     300.9          36.6               13.7 +/-    1.70      21.0 +/-    1.70  0.080 / 0.110
G28     96.0           37.6               15.9 +/-    0.88      24.1 +/-    0.88  0.090 / 0.110