PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/23-06:58:00
G02     229.7          73.3                3.5 +/-    0.35       3.6 +/-    0.35  0.280 / 0.480
G05     173.4          12.0                1.7 +/-    7.58       4.5 +/-    7.58  0.350 / 0.480
G06     42.9           67.9                2.5 +/-    0.50       2.7 +/-    0.50  0.050 / 0.090
G12     320.8          44.9                3.1 +/-    0.61       4.2 +/-    0.61  0.060 / 0.080
G17     66.6           25.9                2.4 +/-    1.66       4.6 +/-    1.66  0.030 / 0.040
G19     52.5           41.4                2.0 +/-    1.23       2.8 +/-    1.23  0.030 / 0.040
G24     252.6          37.7                4.0 +/-    1.79       6.1 +/-    1.79  0.080 / 0.080