PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/23-07:27:50
G02     200.6          28.1                5.4 +/-    1.23       9.8 +/-    1.23  0.100 / 0.090
G06     175.4          56.1                5.9 +/-    0.67       6.9 +/-    0.67  0.080 / 0.080
G17     29.1           54.7                2.0 +/-    1.01       2.4 +/-    1.01  0.040 / 0.030
G19     345.2          69.0                1.5 +/-    0.48       1.6 +/-    0.48  0.030 / 0.030
G24     306.7          32.6                1.2 +/-    2.65       1.9 +/-    2.65  0.030 / 0.030
G28     95.0           35.6                4.4 +/-    0.95       6.9 +/-    0.95  0.040 / 0.030