# y-axis length for LOWESS curve in Stata

I have a problem considering the length of the y-axis in a LOWESS plot in Stata. The y variable ranges from 0 to 50. I would like to run the LOWESS on all the data but only display the graph for the range of y from 30 to 50. I've searched throughout the net, but I just found that I would also have to restrict the data to $\ge$ 30, but that of course changes the curve. Do you have any advice? The graphs are simply unusable for that y-axis interval. Thanks!