PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/21-20:57:50
G03     241.3          69.2               11.0 +/-    0.48      11.7 +/-    0.48  0.040 / 0.040
G09     301.7          15.5                7.7 +/-    1.67      19.0 +/-    1.67  0.040 / 0.040
G14     97.7           16.6               10.3 +/-    2.08      24.6 +/-    2.08  0.160 / 0.160
G16     134.6          56.8               12.2 +/-    0.48      14.3 +/-    0.48  0.140 / 0.310
G22     196.5          58.0               12.4 +/-    0.80      14.4 +/-    0.80  0.030 / 0.040
G23     317.6          47.4                9.5 +/-    1.07      12.4 +/-    1.07  0.030 / 0.030
G26     73.7           53.1                9.0 +/-    0.80      10.9 +/-    0.80  0.100 / 0.190
G31     50.8           21.8                7.4 +/-    2.33      15.7 +/-    2.33  0.140 / 0.230