S2P impedence match

there is a S2P file, reference impadence is 50-ohm. I want to convert the Port1 input reference is 75-ohm, Port 2 output reference is 50-ohm. and get new SMITH chart and new S21 chart.

the follow is my code , this looks like Port1 & port 2 both are 75-ohm.

data = read(rfdata.data,'.\SP\B01.S2P');

extract(data,'S_PARAMETERS',75)

hold off;

h = smith(data,'S11');

set(h, 'Color', [1 0 0],'LineWidth',3);

hold on

s11 = s_params(1,1,:);

i = smithchart(s11(:));