PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/18-18:27:40
G01     228.5          19.0               11.4 +/-    2.95      25.6 +/-    2.95  0.040 / 0.040
G03     288.2          68.7                9.4 +/-    0.83      10.0 +/-    0.83  0.030 / 0.040
G14     83.6           27.1               11.4 +/-    2.13      21.1 +/-    2.13  0.040 / 0.060
G16     149.8          42.2               13.4 +/-    0.71      18.8 +/-    0.71  0.040 / 0.070
G22     218.5          72.3               10.9 +/-    1.12      11.4 +/-    1.12  0.040 / 0.070
G23     306.1          36.6                9.7 +/-    1.16      15.0 +/-    1.16  0.040 / 0.090
G26     101.6          53.5               11.6 +/-    0.57      14.1 +/-    0.57  0.090 / 0.200
G31     44.4           34.0                9.2 +/-    1.22      14.9 +/-    1.22  0.110 / 0.190