Hi! I am very new to visualizing data through Stata.

I have used this code below to create my bar chart:

Code:
    graph bar (sum) maize (sum) beans (sum) potato (sum) peas, over(place) ytitle(Frequency) title(Frequency of Crop Types by Region)
The resulting graph is this:

Array

In the label section, the variable names come as "sum of maize", etc. I want to only keep them as "maize," removing "sum of" in the beginning. Could you inform me how I can do that? I have checked out write-ups on bar charts, but they do not address this explicitly.

Thanks!