PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-09:27:50
G01     220.1423       11.1649          4.5703 +/-  2.8968   12.4328 +/-  2.8968  0.060 / 0.110
G03     268.1371       68.7977          3.4119 +/-  0.7567    3.6320 +/-  0.7567  0.070 / 0.080
G09     299.7218       14.6861          1.7878 +/-  1.6154    4.4809 +/-  1.6154  0.050 / 0.050
G14     94.6564        17.4067          3.4198 +/-  1.9803    8.0193 +/-  1.9803  0.040 / 0.050
G16     139.2744       53.1233          6.9868 +/-  0.8300    8.4952 +/-  0.8300  0.040 / 0.030
G22     198.6636       62.5947          4.3290 +/-  0.6818    4.8111 +/-  0.6818  0.040 / 0.030
G23     312.8016       42.2763          3.9128 +/-  1.3128    5.4895 +/-  1.3128  0.160 / 0.370
G26     83.3072        54.7428          4.2955 +/-  0.5654    5.1319 +/-  0.5654  0.130 / 0.320
G31     48.5221        25.2084          2.8502 +/-  0.9064    5.5426 +/-  0.9064  0.030 / 0.050