PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-22:27:10
G02     201.9          31.5               15.9 +/-    1.04      27.1 +/-    1.04  0.090 / 0.100
G06     168.9          62.9               14.1 +/-    0.77      15.6 +/-    0.77  0.070 / 0.100
G17     33.1           51.3               11.8 +/-    1.46      14.7 +/-    1.46  0.050 / 0.080
G19     353.1          67.3               11.8 +/-    1.15      12.7 +/-    1.15  0.050 / 0.080
G24     300.6          36.9               11.4 +/-    2.29      17.5 +/-    2.29  0.030 / 0.030
G28     96.2           37.3               12.9 +/-    0.97      19.6 +/-    0.97  0.030 / 0.030