PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/19-21:43:00
G02     203.4          36.4               19.7 +/-    1.36      30.4 +/-    1.36  0.130 / 0.190
G06     155.1          71.0               18.6 +/-    0.40      19.5 +/-    0.40  0.170 / 0.190
G12     308.5          16.9               14.2 +/-    1.81      33.6 +/-    1.81  0.070 / 0.110
G17     34.3           50.8               15.9 +/-    0.77      19.9 +/-    0.77  0.080 / 0.120
G19     0.3            65.2               15.7 +/-    0.44      17.1 +/-    0.44  0.030 / 0.020
G24     296.3          38.9               15.5 +/-    2.98      23.0 +/-    2.98  0.030 / 0.030
G28     103.9          30.2               16.6 +/-    1.17      29.1 +/-    1.17  0.070 / 0.120