[PLUG] Plotting data - was [ RE-introduction to spreadsheets after decades ; /]

[Richard Owlett]

On 02/22/2020 06:38 AM, Richard Owlett wrote:
> I've not used a spreadsheet in THIS *CENTURY*.
> I have forgotten much.
> 

Rich Shepard's answer of 2/22 allowed me to select appropriate data for 
a calculation. A simple plot demonstrated I didn't know as much about my 
data as a thought I did. That suggested a different calculation. I wish 
to plot that 2nd calculated series.

Column A has values for x-axis on all potential plots.
Column B has values for the first calculation
Column C has values for the 2nd calculation.

Plotting "B" vs "A" was no problem as they were adjacent columns.
Now I want to plot a portion of "C" vs "A".

I.E.
my original plot used data from $B$1:$B$285 vs $A$1:$A$285
my new plot should be of $C$30:$C$60 vs $A$30:$A$60

HOW?

Should be in manual.
*HOWEVER* 
[https://help.gnome.org/users/gnumeric/stable/gnumeric.html#sect-graphs-preselect] 
states "This section is not yet written" :{

TIA