Identifying extra information in width/height argument

Coding
1

Hi all, I inherited a code for a task from someone who is no longer in my lab. The value of a variable y1 is determined by button responses. That value then determines dimensions of a rectangle on the screen:

Scale = visual.Rect(win=win, 
                                width=(y1, 0.11)[0], 
                                height=(y1, 0.18)[1], 
                                ori=0.0, 
                                pos=(0.6, 0),
                                lineWidth=1.0,  
                               colorSpace='rgb',  
                               lineColor='darkGrey', 
                               fillColor='green',
                               opacity=0.5, 
                               depth=-6.0, 
                               interpolate=True)

I can’t figure out what the second values following y1 represent in the width and height arguments. I’d tried modifying them and seeing what I can notice in the script and the data, but I can’t find any differences. Documentation online for both width and height in the visual.Rect entry isn’t helpful either. Are these perhaps leftovers that Python is ignoring?