PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/30-20:58:00
G01     250.7          35.0               12.9 +/-    1.93      20.5 +/-    1.93  0.030 / 0.030
G03     315.8          44.7                8.9 +/-    0.71      12.1 +/-    0.71  0.040 / 0.030
G11     237.9          12.6               12.8 +/-    3.14      33.7 +/-    3.14  0.120 / 0.190
G14     60.7           40.7                8.0 +/-    1.26      11.5 +/-    1.26  0.120 / 0.150
G22     304.4          66.2               10.3 +/-    0.89      11.2 +/-    0.89  0.060 / 0.330
G23     286.8          19.3               11.4 +/-    1.98      25.5 +/-    1.98  0.110 / 0.360
G25     39.5           10.0                6.1 +/-    2.18      17.0 +/-    2.18  0.040 / 0.030
G26     137.4          37.9               13.4 +/-    1.41      20.1 +/-    1.41  0.030 / 0.040
G31     40.4           59.3                8.9 +/-    0.39      10.2 +/-    0.39  0.060 / 0.100
G32     77.6           23.0                7.7 +/-    1.50      15.8 +/-    1.50  0.080 / 0.130