PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/03/21-18:28:00
G07     310.5          49.9               10.8 +/-    0.83      13.6 +/-    0.83  0.040 / 0.070
G08     127.1          40.0               13.9 +/-    1.01      20.2 +/-    1.01  0.050 / 0.060
G09     307.9          76.8               11.8 +/-    0.68      12.1 +/-    0.68  0.080 / 0.070
G16     41.9           30.1                9.7 +/-    1.46      17.0 +/-    1.46  0.070 / 0.060
G23     143.3          66.1               12.9 +/-    0.50      14.0 +/-    0.50  0.040 / 0.030
G27     83.6           37.8               10.8 +/-    0.64      16.4 +/-    0.64  0.030 / 0.030
G30     285.2          21.9               10.9 +/-    1.46      22.9 +/-    1.46  0.140 / 0.180