How to convolve a known gaussian distribution to a curve?

%I have a measured data file in the attached file. load data.mat x1=data(:,1); y1=data(:,2); % and I know the resolution is a gaussian distribution as: y=(1/(sqrt(2*pi)*0.2123))*exp(-(x-x1)*(x-x1)/(2*0.2123*0.2123));

how to convolve this gaussian distribution to the data curve and get the convolved curve?

Thanks...