PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-12:27:40
G07     320.5461       53.2949          4.2209 +/-  0.8872    5.1224 +/-  0.8872  0.030 / 0.020
G08     115.2379       46.2263          6.4790 +/-  1.0272    8.5821 +/-  1.0272  0.020 / 0.040
G09     235.6354       83.7340          3.2880 +/-  0.4347    3.3058 +/-  0.4347  0.040 / 0.040
G16     43.1309        18.3363          5.2253 +/-  3.3916   11.9760 +/-  3.3916  0.030 / 0.050
G23     149.9004       56.6388          5.7428 +/-  0.4947    6.7294 +/-  0.4947  0.030 / 0.040
G27     67.8120        35.6622          4.1190 +/-  1.0790    6.4576 +/-  1.0790  0.030 / 0.040
G28     228.6946       19.4249          2.6522 +/-  2.5295    5.9182 +/-  2.5295  0.040 / 0.050
G30     290.6729       24.8667          4.4558 +/-  1.6189    8.7331 +/-  1.6189  0.050 / 0.050