PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/26-23:27:40
G03     208.6          53.9                9.7 +/-    0.70      11.7 +/-    0.70  0.070 / 0.070
G07     260.3          18.0                9.8 +/-    1.72      22.6 +/-    1.72  0.060 / 0.080
G09     312.1          30.9                7.8 +/-    1.17      13.4 +/-    1.17  0.040 / 0.030
G16     91.6           66.2                8.7 +/-    0.72       9.5 +/-    0.72  0.040 / 0.030
G22     187.4          38.0                9.5 +/-    0.52      14.3 +/-    0.52  0.250 / 0.210
G23     333.5          63.0                7.3 +/-    0.67       8.1 +/-    0.67  0.270 / 0.300
G26     51.2           41.6                5.8 +/-    1.21       8.2 +/-    1.21  0.090 / 0.100
G27     129.9          13.8               11.6 +/-    2.23      29.7 +/-    2.23  0.120 / 0.080