PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-21:42:40
G02     204.7          40.2               16.6 +/-    2.72      24.1 +/-    2.72  0.050 / 0.080
G06     146.4          74.5               14.4 +/-    1.00      14.9 +/-    1.00  0.060 / 0.080
G12     310.5          19.9               11.3 +/-    2.02      25.0 +/-    2.02  0.140 / 0.210
G17     38.0           48.0               10.9 +/-    0.69      14.1 +/-    0.69  0.110 / 0.220
G19     7.8            63.1               11.2 +/-    0.90      12.4 +/-    0.90  0.040 / 0.100
G24     291.9          40.4               11.3 +/-    1.11      16.4 +/-    1.11  0.100 / 0.060
G28     107.3          27.7               11.9 +/-    2.66      21.9 +/-    2.66  0.090 / 0.160