PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-10:58:10
G03     200.4321       38.9532          4.4292 +/-  1.2434    6.5549 +/-  1.2434  0.040 / 0.040
G07     276.0703       30.7294          4.5971 +/-  1.1407    7.9300 +/-  1.1407  0.030 / 0.040
G08     150.3683       15.3258          5.5336 +/-  4.4598   13.6554 +/-  4.4598  0.040 / 0.050
G09     319.5173       48.1312          3.0044 +/-  1.2943    3.8796 +/-  1.2943  0.040 / 0.050
G16     53.4862        55.3097          3.2327 +/-  0.5029    3.8394 +/-  0.5029  0.050 / 0.090
G22     180.9952       20.6971          2.2097 +/-  2.2079    4.7803 +/-  2.2079  0.040 / 0.080
G23     357.4362       77.1961          3.2636 +/-  0.4881    3.3381 +/-  0.4881  0.080 / 0.100
G26     43.7983        27.1302          1.9077 +/-  1.8332    3.5529 +/-  1.8332  0.080 / 0.100
G27     115.8533       24.8152          4.0755 +/-  1.9675    7.9972 +/-  1.9675  0.070 / 0.150