PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-16:57:50
G03     187.5          15.3               14.3 +/-    3.16      35.3 +/-    3.16  0.060 / 0.140
G07     294.7          39.7               12.8 +/-    1.14      18.6 +/-    1.14  0.070 / 0.130
G08     142.0          30.6               16.6 +/-    1.73      28.7 +/-    1.73  0.030 / 0.040
G09     318.8          67.1               11.7 +/-    1.42      12.6 +/-    1.42  0.030 / 0.040
G16     41.9           33.1               10.3 +/-    1.14      17.0 +/-    1.14  0.050 / 0.140
G23     130.2          70.0               14.5 +/-    0.76      15.3 +/-    0.76  0.080 / 0.140
G27     93.0           35.5               14.0 +/-    0.44      22.0 +/-    0.44  0.040 / 0.100
G30     278.0          16.8               13.8 +/-    2.50      32.8 +/-    2.50  0.060 / 0.080