PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-11:42:50
G03     191.7893       19.9386          3.8322 +/-  3.4017    8.4448 +/-  3.4017  0.030 / 0.020
G07     296.1154       42.0388          3.4706 +/-  2.2819    4.8869 +/-  2.2819  0.030 / 0.030
G08     136.7701       31.3888          4.1064 +/-  1.4725    6.9891 +/-  1.4725  0.100 / 0.090
G09     320.5581       68.0564          2.8499 +/-  0.7482    3.0475 +/-  0.7482  0.120 / 0.080
G16     42.0309        36.8408          2.3796 +/-  0.7232    3.6524 +/-  0.7232  0.030 / 0.020
G23     122.2726       78.0585          2.0593 +/-  1.2426    2.1000 +/-  1.2426  0.030 / 0.020
G26     43.7759        10.1066          4.3530 +/-  2.4415   12.1145 +/-  2.4415  0.070 / 0.060
G27     94.0904        34.7359          3.3434 +/-  1.1840    5.3321 +/-  1.1840  0.090 / 0.060
G30     274.9168       12.4828          5.5920 +/-  1.3900   14.7660 +/-  1.3900  0.150 / 0.250