PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/13-23:57:50
G02     297.5          81.8                9.1 +/-    0.75       9.2 +/-    0.75  0.040 / 0.040
G05     166.8          26.2               14.2 +/-    1.39      26.9 +/-    1.39  0.040 / 0.040
G06     40.2           47.6                8.8 +/-    1.26      11.4 +/-    1.26  0.100 / 0.130
G12     319.5          63.0               10.5 +/-    0.38      11.7 +/-    0.38  0.070 / 0.110
G17     77.9           19.1                9.3 +/-    2.06      21.0 +/-    2.06  0.090 / 0.160
G19     66.3           33.6               10.0 +/-    1.69      16.3 +/-    1.69  0.090 / 0.200
G24     235.1          28.4               13.3 +/-    0.89      24.1 +/-    0.89  0.040 / 0.050
G25     317.8          20.5                8.9 +/-    2.52      19.4 +/-    2.52  0.030 / 0.040