PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/12/20-10:27:50
G02     60.1           30.6                5.5 +/-    1.81       9.6 +/-    1.81  0.030 / 0.020
G05     60.6           63.3                5.0 +/-    0.44       5.5 +/-    0.44  0.030 / 0.020
G12     183.0          33.0                5.9 +/-    0.93       9.7 +/-    0.93  0.050 / 0.090
G13     127.3          14.1                8.2 +/-    1.92      20.8 +/-    1.92  0.080 / 0.080
G15     161.3          13.5                5.5 +/-    7.30      14.1 +/-    7.30  0.160 / 0.200
G21     271.3          17.5                4.5 +/-    1.73      10.6 +/-    1.73  0.130 / 0.190
G25     237.3          52.8                6.1 +/-    4.80       7.4 +/-    4.80  0.030 / 0.040
G29     327.3          52.5                5.1 +/-    0.39       6.2 +/-    0.39  0.050 / 0.040