PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/19-17:12:40
G07     31.2           69.5               15.4 +/-    0.63      16.3 +/-    0.63  0.230 / 0.580
G08     58.0           46.4               14.3 +/-    0.66      18.9 +/-    0.66  0.090 / 0.480
G09     179.0          43.2               16.3 +/-    0.74      22.6 +/-    0.74  0.040 / 0.040
G11     125.9          31.1               15.5 +/-    1.84      26.6 +/-    1.84  0.040 / 0.040
G18     110.0          13.3               14.2 +/-    2.74      36.8 +/-    2.74  0.100 / 0.160
G23     159.0          10.1               12.1 +/-    3.64      33.7 +/-    3.64  0.160 / 0.160
G27     38.4           12.2               11.4 +/-    2.28      30.3 +/-    2.28  0.140 / 0.280
G28     266.9          49.4               15.6 +/-    4.45      19.8 +/-    4.45  0.150 / 0.330
G30     326.8          55.9               14.5 +/-    0.67      17.2 +/-    0.67  0.080 / 0.130