PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/03/21-04:42:20
G02     48.3           41.6                3.5 +/-    1.11       4.9 +/-    1.11  0.040 / 0.040
G05     90.0           68.8                5.0 +/-    0.69       5.3 +/-    0.69  0.030 / 0.040
G12     190.5          51.0                6.4 +/-    0.94       8.0 +/-    0.94  0.030 / 0.040
G25     260.4          59.0                5.0 +/-    1.05       5.8 +/-    1.05  0.030 / 0.040
G29     322.9          46.8                3.7 +/-    0.60       4.9 +/-    0.60  0.030 / 0.030