PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-21:43:00
G01     248.6          34.0               11.4 +/-    1.51      18.5 +/-    1.51  0.030 / 0.030
G03     315.4          46.1                8.9 +/-    0.93      11.8 +/-    0.93  0.030 / 0.030
G11     236.1          11.6               11.6 +/-    1.42      31.2 +/-    1.42  0.030 / 0.030
G14     62.8           39.4                8.3 +/-    1.74      12.2 +/-    1.74  0.050 / 0.040
G16     164.6          18.5                4.3 +/-   23.14       9.9 +/-   23.14  0.110 / 0.200
G22     301.9          67.6                9.4 +/-    0.57      10.1 +/-    0.57  0.100 / 0.180
G23     288.1          20.2                8.4 +/-    2.14      18.3 +/-    2.14  0.040 / 0.080
G26     136.2          39.3               12.0 +/-    0.95      17.7 +/-    0.95  0.040 / 0.080
G31     40.0           57.9                8.0 +/-    0.46       9.2 +/-    0.46  0.090 / 0.130
G32     79.0           22.1                7.3 +/-    1.16      15.3 +/-    1.16  0.090 / 0.170