PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/27-21:58:00
G02     201.4          28.9               16.4 +/-    1.45      29.3 +/-    1.45  0.060 / 0.110
G06     169.9          60.3               16.1 +/-    1.11      18.2 +/-    1.11  0.070 / 0.110
G17     30.6           53.4               12.1 +/-    0.64      14.7 +/-    0.64  0.040 / 0.050
G19     347.1          68.5               11.5 +/-    0.76      12.2 +/-    0.76  0.040 / 0.040
G24     303.0          35.4               11.6 +/-    1.37      18.2 +/-    1.37  0.050 / 0.100
G28     93.5           38.9               12.6 +/-    0.61      18.7 +/-    0.61  0.040 / 0.090