PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/19-22:12:30
G02     209.1          50.5               18.7 +/-    1.06      23.5 +/-    1.06  0.060 / 0.070
G06     99.3           79.2               17.1 +/-    0.50      17.4 +/-    0.50  0.070 / 0.070
G12     315.1          27.9               12.7 +/-    1.70      23.2 +/-    1.70  0.070 / 0.150
G17     46.9           41.3               15.9 +/-    0.72      22.6 +/-    0.72  0.070 / 0.160
G19     24.4           56.8               15.9 +/-    0.62      18.6 +/-    0.62  0.100 / 0.190
G24     278.8          42.5               15.8 +/-    1.27      22.0 +/-    1.27  0.080 / 0.190
G28     115.6          20.7               18.8 +/-    1.16      40.7 +/-    1.16  0.050 / 0.080