The horizontal scale should be 15Hz to 200Hz.
The vertical scale should be 45dB to 105dB.
Enter these into the Graph Axis Limits pop-up that starts when you click the Graph Limits ICON at the top tight hand side of the main REW screen.
It will remember these limits and you can click it anytime to return your display to those scales.
Graph Axis Limits.jpg
To save the graph in a jpg, simply click the icon located at the bottom left of the graph and create a jpg at 800 width.
I have no idea how you are getting those one inch high graphs?
It's impossible to interpret them until you supply a normal sized plot....
brucek