PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-11:12:40
G03     197.3542       32.7046          3.4891 +/-  0.9777    5.7850 +/-  0.9777  0.040 / 0.030
G07     282.1381       34.3769          3.7678 +/-  0.8423    6.0496 +/-  0.8423  0.040 / 0.040
G08     146.4194       20.3257          4.2473 +/-  2.0459    9.2716 +/-  2.0459  0.120 / 0.110
G09     321.0553       54.2422          3.0233 +/-  1.0249    3.6314 +/-  1.0249  0.090 / 0.080
G16     47.6183        49.6801          2.6694 +/-  0.6193    3.3798 +/-  0.6193  0.030 / 0.020
G22     179.2003       14.9563          3.5254 +/-  1.4897    8.7783 +/-  1.4897  0.030 / 0.020
G23     24.7678        82.1005          1.8314 +/-  1.3426    1.8471 +/-  1.3426  0.080 / 0.090
G26     43.0114        21.6135          1.9056 +/-  2.6807    4.0321 +/-  2.6807  0.080 / 0.080
G27     109.6330       28.5883          3.4009 +/-  1.2789    6.1361 +/-  1.2789  0.150 / 0.250