PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-23:27:40
G02     291.6          81.6                6.9 +/-    0.78       7.0 +/-    0.78  0.040 / 0.030
G05     167.1          25.6               12.9 +/-    1.34      24.8 +/-    1.34  0.030 / 0.040
G06     40.2           48.1                7.1 +/-    1.03       9.2 +/-    1.03  0.110 / 0.130
G12     319.8          62.6                8.8 +/-    0.72       9.7 +/-    0.72  0.080 / 0.100
G17     77.6           19.1                8.0 +/-    1.69      18.0 +/-    1.69  0.050 / 0.050
G19     65.6           34.1                9.6 +/-    1.19      15.5 +/-    1.19  0.040 / 0.030
G24     235.6          28.8               12.3 +/-    0.84      22.1 +/-    0.84  0.070 / 0.190
G25     317.8          20.0                7.7 +/-    2.41      17.0 +/-    2.41  0.070 / 0.220