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          6.8160 +/-  0.9220    7.3760 +/-  0.9220  0.050 / 0.150
G08     70.7386        49.6028          7.1585 +/-  0.2732    9.0723 +/-  0.2732  0.060 / 0.140
G09     179.0943       55.8746          7.3511 +/-  1.3494    8.6803 +/-  1.3494  0.090 / 0.190
G11     132.4197       22.5186          9.4219 +/-  1.3547   19.5092 +/-  1.3547  0.100 / 0.250
G23     159.4811       27.5558          8.0349 +/-  0.6249   14.8250 +/-  0.6249  0.030 / 0.050
G27     43.3484        21.2373          6.9577 +/-  1.2157   14.8560 +/-  1.2157  0.030 / 0.040
G28     251.4974       40.8595          8.2729 +/-  1.4708   11.8669 +/-  1.4708  0.060 / 0.070
G30     312.5511       43.2649          6.4455 +/-  1.0245    8.9081 +/-  1.0245  0.060 / 0.070