![Image](https://i.stack.imgur.com/l2o61.png)
So i have in some **.asc** file by 4 columns as you can see here:
![Image](https://i.stack.imgur.com/ZzqRA.png)
And some others i have 6 columns as you can see here:
![Image](https://i.stack.imgur.com/XzUJE.png)
So i like to know why there is some extra columns by the name of **Approx. distances** and
**Temp. approx. distances** ?
Also asked here:
https://engineering.stackexchange.com/q ... s-vs-appro
Thanks.