PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/23-22:12:30
G07     341.7          60.9               12.1 +/-    0.51      13.6 +/-    0.51  0.130 / 0.130
G08     92.6           53.6               13.1 +/-    1.09      15.8 +/-    1.09  0.170 / 0.120
G09     187.7          68.2               14.0 +/-    0.69      15.0 +/-    0.69  0.090 / 0.120
G11     144.5          15.9               19.5 +/-    2.68      47.5 +/-    2.68  0.060 / 0.090
G23     156.7          33.9               15.9 +/-    0.98      25.8 +/-    0.98  0.040 / 0.030
G27     49.3           27.7                8.7 +/-    1.71      15.9 +/-    1.71  0.050 / 0.040
G28     242.7          34.8               14.5 +/-    2.39      23.1 +/-    2.39  0.040 / 0.040
G30     309.5          42.5               11.5 +/-    0.86      16.1 +/-    0.86  0.040 / 0.030