data = [49.5 60;
        53   60;
        58   52;
        61   42;
        65   38];
    
plot(data(:,1),data(:,2),'o','markersize',4);
hold on;
plot(data(:,1),data(:,2));
xlabel('Drive frequency (MHz)');
ylabel('First order intensity ({\mu}W)');
title('Diffraction efficiency vs. frequency');
ylim([35 65]);
grid on;