PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-20:28:10
G02     299.1717       80.0330         13.8356 +/-  0.5906   14.0257 +/-  0.5906  0.030 / 0.020
G05     168.3005       28.3220         18.8758 +/-  1.8345   34.2524 +/-  1.8345  0.040 / 0.030
G06     41.3121        42.6805         11.8860 +/-  1.0200   16.5726 +/-  1.0200  0.030 / 0.030
G12     314.9519       69.8391         12.7883 +/-  0.5409   13.5308 +/-  0.5409  0.030 / 0.030
G17     85.0941        10.8631         12.7693 +/-  2.1350   34.9674 +/-  2.1350  0.140 / 0.130
G19     73.7047        27.3485         11.2462 +/-  2.2993   20.8448 +/-  2.2993  0.130 / 0.120
G25     317.3582       30.3272         13.1209 +/-  1.7439   22.8220 +/-  1.7439  0.070 / 0.110