Use the contour filter to display isolines#
Add a contour filter
![../../../../../../_images/add-contour.png](../../../../../../_images/add-contour.png)
Chose the variable, you want to contour by, use the red x to get rid of the default contour level, use the scale icon (below + and -) to create a number series, (see below), finally select the levels 100
and the 0
and use the +
to add -50
and 50
levels below them.
![../../../../../../_images/contour-levels.png](../../../../../../_images/contour-levels.png)
![../../../../../../_images/number-series.png](../../../../../../_images/number-series.png)
Adjust the line width to 5
by searching for line
in the search box in the top and then adjusting it.
![../../../../../../_images/line-width.png](../../../../../../_images/line-width.png)
Select BrBG
as colormap, invert it, and set the value range to -100
to 100
.