PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-01:27:50
G02     287.5          81.9                5.5 +/-    0.94       5.6 +/-    0.94  0.030 / 0.050
G05     167.4          24.6               10.1 +/-    1.15      19.9 +/-    1.15  0.030 / 0.040
G06     40.0           50.1                5.5 +/-    0.34       6.9 +/-    0.34  0.050 / 0.170
G12     320.2          60.3                7.6 +/-    0.59       8.6 +/-    0.59  0.050 / 0.160
G17     75.8           21.3                6.2 +/-    0.76      13.2 +/-    0.76  0.080 / 0.150
G19     64.8           34.3                6.5 +/-    0.57      10.4 +/-    0.57  0.080 / 0.130
G24     237.2          29.7                9.2 +/-    2.09      16.3 +/-    2.09  0.040 / 0.040
G25     317.7          18.7                6.2 +/-    1.50      14.2 +/-    1.50  0.040 / 0.030