Which Line on the Smith Chart Indicates SWR?

[WolfOfTheSteps]

http://www.sss-mag.com/pdf/smithchart.pdf" , which scale at the bottom tells me the SWR?

Is it the top line or the second line? (Among the 4 straight lines at the bottom of the chart) I'm confused because on the right and left of the line there are two different labels (SWR and ATTEN). Also, is the units of SWR in dBS?

Thanks.

 

[abdo375]

The SWR is measured from the first line, yes you can measure the standing wave ratio in dBS but only if you want to (there is another scale, right??), only the right part of the first line is the SWR the left is ATTEN.