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          3.7794 +/-  1.1008    6.2664 +/-  1.1008  0.030 / 0.040
G07     282.1381       34.3769          3.2095 +/-  1.5789    5.1532 +/-  1.5789  0.030 / 0.040
G08     146.4194       20.3257          3.4267 +/-  2.7700    7.4803 +/-  2.7700  0.040 / 0.060
G09     321.0553       54.2422          3.0070 +/-  1.4620    3.6118 +/-  1.4620  0.040 / 0.050
G16     47.6183        49.6801          3.1525 +/-  0.5869    3.9914 +/-  0.5869  0.060 / 0.120
G22     179.2003       14.9563          2.5222 +/-  2.4331    6.2802 +/-  2.4331  0.060 / 0.110
G23     24.7678        82.1005          2.1845 +/-  0.6268    2.2033 +/-  0.6268  0.050 / 0.120
G26     43.0114        21.6135          2.3211 +/-  0.8910    4.9114 +/-  0.8910  0.050 / 0.120
G27     109.6330       28.5883          4.6079 +/-  1.2616    8.3139 +/-  1.2616  0.140 / 0.310