PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-22:57:40
G02     201.8          31.9               14.4 +/-    1.07      24.3 +/-    1.07  0.190 / 0.250
G06     163.4          65.5               12.7 +/-    0.23      13.8 +/-    0.23  0.120 / 0.200
G12     305.6          12.6                9.7 +/-    2.13      25.6 +/-    2.13  0.140 / 0.110
G17     27.9           55.3               10.0 +/-    1.30      11.9 +/-    1.30  0.080 / 0.100
G19     349.9          67.6                9.8 +/-    0.35      10.5 +/-    0.35  0.040 / 0.030
G24     301.8          36.2               10.7 +/-    2.58      16.6 +/-    2.58  0.030 / 0.030
G28     99.1           33.3               11.7 +/-    1.05      19.1 +/-    1.05  0.060 / 0.120