PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/21-19:42:40
G07     313.7          49.6               11.5 +/-    0.66      14.6 +/-    0.66  0.140 / 0.230
G08     126.0          44.6               14.2 +/-    0.83      19.3 +/-    0.83  0.040 / 0.060
G09     272.6          82.2               13.3 +/-    0.93      13.4 +/-    0.93  0.030 / 0.020
G16     43.0           18.3                8.2 +/-    3.38      18.8 +/-    3.38  0.030 / 0.020
G23     148.0          53.7               13.2 +/-    0.44      16.0 +/-    0.44  0.170 / 0.270
G27     70.1           36.4               11.0 +/-    1.08      17.0 +/-    1.08  0.150 / 0.200
G28     227.8          18.5               16.2 +/-    2.96      36.9 +/-    2.96  0.040 / 0.060
G30     292.2          28.4               10.1 +/-    2.23      18.3 +/-    2.23  0.040 / 0.050