E.g. i have a text file called 80C

the data in there is like

1 2
2 3
4 5
6 7

First column is x, second y, now I want to plot an xy graph with x > 1 and x<5(e.g.), how do I write the code?

I tried this

hello

I wanted only wanted x from txt file that were >400 but less than 700

But there was no effect

hello2

Array splicing also makes no difference