PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-22:27:40
G02     202.9          35.2               17.4 +/-    1.81      27.5 +/-    1.81  0.100 / 0.090
G06     165.5          67.1               16.2 +/-    0.49      17.4 +/-    0.49  0.080 / 0.090
G12     306.3          12.9               14.4 +/-    1.61      37.6 +/-    1.61  0.110 / 0.210
G17     36.4           48.6               14.1 +/-    1.64      18.1 +/-    1.64  0.120 / 0.300
G19     1.7            65.2               13.4 +/-    0.86      14.7 +/-    0.86  0.070 / 0.090
G24     296.7          38.8               14.6 +/-    2.64      21.7 +/-    2.64  0.070 / 0.100
G28     100.0          35.0               15.1 +/-    1.17      24.0 +/-    1.17  0.030 / 0.030