PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-22:28:10
G02     201.6          30.0               15.5 +/-    1.64      27.1 +/-    1.64  0.070 / 0.100
G06     169.8          61.3               14.4 +/-    0.91      16.2 +/-    0.91  0.070 / 0.110
G17     31.8           52.4               12.7 +/-    1.15      15.6 +/-    1.15  0.060 / 0.070
G19     349.6          68.0               12.0 +/-    1.08      12.8 +/-    1.08  0.060 / 0.100
G24     301.9          36.2               11.8 +/-    2.17      18.3 +/-    2.17  0.030 / 0.030
G28     94.7           38.1               14.4 +/-    0.82      21.5 +/-    0.82  0.040 / 0.040