PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-20:58:00
G01     88.1           32.3               13.8 +/-    1.83      23.0 +/-    1.83  0.050 / 0.140
G07     127.1          44.4               16.1 +/-    1.08      21.8 +/-    1.08  0.090 / 0.140
G11     68.3           40.1               14.0 +/-    1.06      20.4 +/-    1.06  0.020 / 0.030
G13     292.8          36.3               13.3 +/-    3.54      20.6 +/-    3.54  0.030 / 0.030
G15     314.1          10.9               -8.4 +/-    6.13     -22.9 +/-    6.13  0.080 / 0.090
G17     216.7          50.2               17.2 +/-    1.27      21.6 +/-    1.27  0.080 / 0.080
G18     62.5           23.7               11.3 +/-    1.23      22.8 +/-    1.23  0.050 / 0.050
G19     215.6          27.9               17.0 +/-    1.84      31.1 +/-    1.84  0.040 / 0.060
G28     353.5          61.6               13.6 +/-    0.67      15.2 +/-    0.67  0.050 / 0.050
G30     112.0          72.9               15.8 +/-    1.04      16.5 +/-    1.04  0.040 / 0.060