PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-13:28:00
G07     8.9887         66.2216          7.7065 +/-  0.4048    8.3397 +/-  0.4048  0.040 / 0.030
G08     70.7386        49.6028          6.1647 +/-  0.6466    7.8129 +/-  0.6466  0.050 / 0.040
G09     179.0943       55.8746          8.0928 +/-  0.7133    9.5560 +/-  0.7133  0.030 / 0.020
G11     132.4197       22.5186          7.5700 +/-  1.6668   15.6747 +/-  1.6668  0.020 / 0.030
G23     159.4811       27.5558          7.5187 +/-  1.7761   13.8726 +/-  1.7761  0.060 / 0.140
G27     43.3484        21.2373          6.8916 +/-  1.6831   14.7149 +/-  1.6831  0.060 / 0.130
G28     251.4974       40.8595          6.7785 +/-  1.4210    9.7232 +/-  1.4210  0.110 / 0.140
G30     312.5511       43.2649          6.6717 +/-  0.6863    9.2208 +/-  0.6863  0.190 / 0.120