PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-19:28:00
G02     318.2          80.3                6.4 +/-    0.63       6.5 +/-    0.63  0.060 / 0.100
G05     165.6          30.6               11.3 +/-    1.21      19.6 +/-    1.21  0.090 / 0.080
G06     41.4           41.2                6.2 +/-    1.34       8.8 +/-    1.34  0.230 / 0.270
G12     314.5          72.0                6.1 +/-    0.58       6.4 +/-    0.58  0.330 / 0.210
G17     83.8           13.0                8.1 +/-    1.90      21.2 +/-    1.90  0.190 / 0.190
G19     70.5           31.5                7.5 +/-    0.67      12.8 +/-    0.67  0.090 / 0.150
G24     229.4          24.4               12.8 +/-    2.08      25.3 +/-    2.08  0.030 / 0.040
G25     317.5          26.5                7.5 +/-    1.34      14.2 +/-    1.34  0.040 / 0.040