PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-12:42:40
G07     330.2311       56.9401          3.5682 +/-  0.7388    4.1688 +/-  0.7388  0.040 / 0.070
G08     105.0960       49.5140          6.1211 +/-  0.4321    7.7662 +/-  0.4321  0.040 / 0.060
G09     196.2838       78.4928          4.6858 +/-  0.7259    4.7719 +/-  0.7259  0.080 / 0.220
G16     44.9647        12.6528          4.4064 +/-  1.4308   11.5897 +/-  1.4308  0.180 / 0.290
G23     153.4582       49.2108          7.8406 +/-  0.6828    9.9856 +/-  0.6828  0.030 / 0.050
G27     59.9498        33.4240          4.8456 +/-  0.3162    7.9226 +/-  0.3162  0.040 / 0.050
G28     233.2639       25.0846          5.8122 +/-  1.0908   11.3347 +/-  1.0908  0.070 / 0.140
G30     296.0366       29.2090          1.8962 +/-  1.6202    3.3763 +/-  1.6202  0.070 / 0.130