# Could someone help tell what the labels are pointed out by red rectangles?

The following figure comes from the paper The perceptron: A probabilistic model for information storage and organization in the brain

I can tell the labels pointed out by blue rectangles are: "Projection area", "A-units", "$$R_1$$", "inhibitory connections" and "$$R_2$$".

Could someone help tell what the labels are pointed out by red rectangles?

blue: R$$_1$$
blue: R$$_2$$