PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/25-05:12:30
G05     45.8           25.6                3.5 +/-    0.88       6.8 +/-    0.88  0.090 / 0.120
G13     91.9           35.3                8.2 +/-    0.57      12.9 +/-    0.57  0.080 / 0.140
G15     138.5          43.4               10.2 +/-    0.66      14.1 +/-    0.66  0.110 / 0.190
G20     247.7          60.3               10.6 +/-    0.93      12.0 +/-    0.93  0.120 / 0.180
G21     302.1          39.4                7.3 +/-    1.01      10.7 +/-    1.01  0.040 / 0.060
G25     206.5          21.1                6.6 +/-    2.63      14.2 +/-    2.63  0.030 / 0.060
G26     298.6          20.4                6.9 +/-    2.27      15.1 +/-    2.27  0.030 / 0.030
G29     122.6          86.0                7.4 +/-    0.30       7.4 +/-    0.30  0.030 / 0.030