PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-14:58:00
G03     228.3          67.1                9.1 +/-    0.48       9.8 +/-    0.48  0.040 / 0.040
G09     303.9          18.5                7.4 +/-    1.33      16.9 +/-    1.33  0.030 / 0.030
G14     99.6           16.8                8.6 +/-    2.06      20.4 +/-    2.06  0.120 / 0.250
G16     121.7          60.1               10.0 +/-    0.56      11.4 +/-    0.56  0.150 / 0.330
G22     187.9          50.5               10.1 +/-    0.42      12.7 +/-    0.42  0.040 / 0.050
G23     324.2          54.0                8.8 +/-    0.31      10.6 +/-    0.31  0.040 / 0.050
G26     65.4           49.7                8.5 +/-    0.42      10.8 +/-    0.42  0.050 / 0.060
G31     53.4           17.0                7.5 +/-    2.87      17.8 +/-    2.87  0.060 / 0.050