PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-18:43:00
G01     90.4           31.8               11.6 +/-    0.71      19.6 +/-    0.71  0.030 / 0.030
G07     125.4          46.0               12.4 +/-    0.59      16.4 +/-    0.59  0.030 / 0.030
G11     69.6           40.3               11.5 +/-    1.18      16.7 +/-    1.18  0.030 / 0.050
G13     294.8          35.9               14.0 +/-    2.42      21.9 +/-    2.42  0.040 / 0.050
G17     215.0          50.5               14.2 +/-    0.95      17.8 +/-    0.95  0.030 / 0.050
G18     64.2           24.1               10.4 +/-    1.73      20.7 +/-    1.73  0.040 / 0.040
G19     214.7          25.5               13.4 +/-    1.70      25.9 +/-    1.70  0.070 / 0.230
G28     349.3          61.7               10.8 +/-    0.45      12.1 +/-    0.45  0.070 / 0.190
G30     105.0          75.5               12.6 +/-    0.44      12.9 +/-    0.44  0.050 / 0.070