PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/22-09:28:00
G02     256.8          80.1                2.6 +/-    0.44       2.7 +/-    0.44  0.120 / 0.120
G05     170.7          18.9                4.2 +/-    1.63       9.5 +/-    1.63  0.090 / 0.120
G06     38.8           61.1                2.5 +/-    0.65       2.8 +/-    0.65  0.100 / 0.090
G12     321.1          53.6                2.9 +/-    0.55       3.5 +/-    0.55  0.130 / 0.130
G17     74.3           19.7                2.9 +/-    1.24       6.4 +/-    1.24  0.030 / 0.040
G19     61.5           35.6                3.3 +/-    0.62       5.1 +/-    0.62  0.030 / 0.040
G24     243.4          33.1                4.2 +/-    1.85       6.9 +/-    1.85  0.040 / 0.030
G25     317.3          15.2                2.1 +/-    3.22       5.3 +/-    3.22  0.030 / 0.030