PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-09:28:00
G01     220.1423       11.1649          3.6275 +/-  1.4098    9.8680 +/-  1.4098  0.090 / 0.170
G03     268.1371       68.7977          2.9722 +/-  1.5583    3.1640 +/-  1.5583  0.110 / 0.330
G09     299.7218       14.6861          1.1731 +/-  2.0573    2.9402 +/-  2.0573  0.170 / 0.390
G14     94.6564        17.4067          3.9754 +/-  1.9862    9.3223 +/-  1.9862  0.180 / 0.350
G16     139.2744       53.1233          5.7066 +/-  0.4307    6.9386 +/-  0.4307  0.060 / 0.070
G22     198.6636       62.5947          3.5104 +/-  0.4825    3.9014 +/-  0.4825  0.050 / 0.090
G23     312.8016       42.2763          4.1222 +/-  0.9313    5.7832 +/-  0.9313  0.110 / 0.240
G26     83.3072        54.7428          5.5292 +/-  0.5840    6.6059 +/-  0.5840  0.100 / 0.260
G31     48.5221        25.2084          2.2273 +/-  2.2823    4.3312 +/-  2.2823  0.030 / 0.040