PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/27-00:28:00
G01     89.6           32.0                7.7 +/-    1.09      12.9 +/-    1.09  0.030 / 0.040
G07     125.9          45.4                8.8 +/-    0.64      11.8 +/-    0.64  0.040 / 0.040
G11     71.3           41.4                6.9 +/-    0.69       9.9 +/-    0.69  0.100 / 0.110
G13     294.7          35.7                6.8 +/-    1.72      10.7 +/-    1.72  0.090 / 0.090
G15     314.5          10.7               -2.7 +/-   20.47      -7.3 +/-   20.47  0.040 / 0.050
G17     215.4          52.1                8.7 +/-    0.92      10.8 +/-    0.92  0.050 / 0.050
G19     214.9          27.8                8.2 +/-    1.51      15.0 +/-    1.51  0.040 / 0.040
G28     351.6          61.6                7.0 +/-    0.53       7.9 +/-    0.53  0.040 / 0.040
G30     111.2          71.7                8.1 +/-    0.35       8.4 +/-    0.35  0.050 / 0.080