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               15.9 +/-    1.88      27.9 +/-    1.88  0.040 / 0.100
G06     169.8          61.3               15.2 +/-    1.03      17.0 +/-    1.03  0.050 / 0.110
G17     31.8           52.4               12.1 +/-    0.86      14.9 +/-    0.86  0.070 / 0.110
G19     349.6          68.0               11.4 +/-    0.91      12.2 +/-    0.91  0.060 / 0.090
G24     301.9          36.2               12.3 +/-    0.62      19.1 +/-    0.62  0.040 / 0.040
G28     94.7           38.1               13.1 +/-    0.63      19.7 +/-    0.63  0.040 / 0.040