the first few steps then you could (in principledo lot of other things in your codebefore you plot the second curve by plt plot(family_member_nohplt hold('off'notice the use of hold here hold('on'tells python to plot also the following curve(sin the same window python does so until it reads hold('off'if you do not use the hold('on'or hold('off'commandthe second plot command will overwrite the first onei you get only the second curve in case you would like the two curves plotted in two separate plotsyou can do this by plotting the first curve straightforwardly with plt plot(family_member_nohthen do other things in your codebefore you do plt figure(plt plot(family_member_nohnote how the graphs are made continuous by pythondrawing straight lines between the four data points of each family this is the standard way of doing it and was also done when plotting our height computations with ball_plot py in howeversince there were so many data points thenthe curve looked nice and smooth if preferredone may also plot only the data points for examplewriting plt plot( '*'will mark only the data points with the star symbol other symbols like circles etc may be used as well there are many possibilities in python for adding information to plot or for changing its appearance for exampleyou may add legend by the instruction plt legend('this is some legend'or you may add title by plt title('this is some title'the command plt axis([xminxmaxyminymax]will define the plotting range for the axis to stretch from xmin to xmax andsimilarlythe plotting range for the axis from ymin to ymax saving the figure to file is achieved by the command