PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/10/20-13:27:40
G02     32.7           55.1                3.9 +/-    1.25       4.6 +/-    1.25  0.030 / 0.030
G05     147.5          60.4                7.0 +/-    0.46       7.9 +/-    0.46  0.040 / 0.030
G06     53.4           14.9                3.7 +/-    1.71       9.3 +/-    1.71  0.030 / 0.040
G12     193.3          67.1                5.4 +/-    0.64       5.8 +/-    0.64  0.030 / 0.040
G25     297.9          52.7                5.4 +/-    2.57       6.7 +/-    2.57  0.090 / 0.170
G29     306.4          26.9                5.5 +/-    1.43      10.3 +/-    1.43  0.130 / 0.170