PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-21:27:50
G01     54.9           28.4               11.3 +/-    0.72      20.5 +/-    0.72  0.090 / 0.320
G06     178.7          20.2              -18.0 +/-   39.77     -39.3 +/-   39.77  0.090 / 0.390
G07     144.5          17.9               17.1 +/-    1.56      39.6 +/-    1.56  0.080 / 0.230
G11     46.7           20.7               10.2 +/-    1.21      22.1 +/-    1.21  0.100 / 0.270
G13     256.7          33.0               16.1 +/-    1.40      26.6 +/-    1.40  0.050 / 0.070
G15     288.9          16.3               11.2 +/-    1.72      26.9 +/-    1.72  0.060 / 0.070
G17     269.4          75.5               16.0 +/-    0.50      16.4 +/-    0.50  0.060 / 0.110
G19     238.7          54.4               16.2 +/-    1.84      19.4 +/-    1.84  0.070 / 0.110
G28     44.8           54.7               13.3 +/-    0.83      15.9 +/-    0.83  0.080 / 0.250
G30     146.6          45.4               16.0 +/-    1.43      21.4 +/-    1.43  0.070 / 0.230