Spark Plug Heat range Chart

[Ken Valkyrie]

I found this "heat range" chart on the Denso site.
But it doesn't show which way is hot or cold (left to right = hot or cold ?)

 

[Soontobeone]

Here is the NGK chart.

 

[Ken Valkyrie]

Thanks Guys, both great charts & info

 

[Ken Valkyrie]

Here's a couple more plug heat range charts.