PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-19:42:50
G01     87.4           31.9               13.1 +/-    1.09      22.0 +/-    1.09  0.040 / 0.070
G07     127.8          37.5               14.0 +/-    0.63      21.3 +/-    0.63  0.040 / 0.070
G11     65.0           38.7               13.0 +/-    1.59      19.3 +/-    1.59  0.020 / 0.030
G13     291.7          37.4               14.0 +/-    3.24      21.3 +/-    3.24  0.030 / 0.030
G15     313.4          11.3                7.8 +/-   16.54      21.2 +/-   16.54  0.050 / 0.050
G17     214.9          56.0               16.6 +/-    0.61      19.5 +/-    0.61  0.050 / 0.050
G18     59.8           22.4               12.0 +/-    1.38      24.8 +/-    1.38  0.120 / 0.230
G19     214.8          29.1               14.8 +/-    1.51      26.3 +/-    1.51  0.120 / 0.220
G28     342.9          61.6               12.1 +/-    0.81      13.5 +/-    0.81  0.060 / 0.120
G30     112.7          73.0               13.8 +/-    0.82      14.4 +/-    0.82  0.050 / 0.110