PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/27-10:28:00
G02     27.6           60.7                2.0 +/-    0.67       2.2 +/-    0.67  0.030 / 0.030
G05     150.6          54.4                5.1 +/-    0.44       6.1 +/-    0.44  0.030 / 0.030
G06     48.0           27.2                2.6 +/-    2.43       4.8 +/-    2.43  0.020 / 0.020
G12     225.6          76.5                3.5 +/-    0.35       3.6 +/-    0.35  0.020 / 0.020
G19     93.9           14.0                5.5 +/-    3.37      14.0 +/-    3.37  0.150 / 0.210
G20     199.1          15.6                3.2 +/-    1.73       7.9 +/-    1.73  0.110 / 0.210
G25     307.1          47.4                3.2 +/-    1.46       4.2 +/-    1.46  0.040 / 0.080
G29     303.0          25.0                2.3 +/-    1.06       4.5 +/-    1.06  0.090 / 0.080