PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-18:42:30
G07     36.6           69.8               12.4 +/-    0.72      13.1 +/-    0.72  0.040 / 0.060
G08     56.8           46.1               12.3 +/-    0.69      16.3 +/-    0.69  0.040 / 0.070
G09     179.2          41.6               14.1 +/-    0.84      20.0 +/-    0.84  0.030 / 0.030
G11     124.8          32.1               14.8 +/-    0.83      24.9 +/-    0.83  0.030 / 0.030
G18     108.6          14.2               14.7 +/-    1.58      37.2 +/-    1.58  0.140 / 0.310
G27     37.8           10.6               11.1 +/-    2.84      30.5 +/-    2.84  0.160 / 0.330
G28     269.7          50.6               13.8 +/-    2.51      17.2 +/-    2.51  0.030 / 0.030
G30     329.6          57.9               12.3 +/-    0.36      14.2 +/-    0.36  0.030 / 0.030