PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/12-20:58:00
G01     103.1          27.6               12.9 +/-    0.72      23.7 +/-    0.72  0.240 / 0.120
G07     112.4          55.7               13.2 +/-    0.64      15.6 +/-    0.64  0.130 / 0.140
G08     42.2           20.9               10.2 +/-    2.30      22.0 +/-    2.30  0.060 / 0.120
G09     174.6          10.8               17.5 +/-    4.23      48.0 +/-    4.23  0.070 / 0.130
G11     85.9           43.4               14.0 +/-    0.72      19.3 +/-    0.72  0.030 / 0.040
G13     306.6          30.6               13.3 +/-    1.20      23.1 +/-    1.20  0.030 / 0.040
G17     208.8          37.5               14.7 +/-    1.57      22.4 +/-    1.57  0.070 / 0.130
G18     76.7           24.8               11.6 +/-    2.02      22.7 +/-    2.02  0.060 / 0.150
G28     326.8          61.6               11.9 +/-    0.64      13.4 +/-    0.64  0.030 / 0.030
G30     55.8           78.9               13.0 +/-    1.29      13.3 +/-    1.29  0.030 / 0.020