Xert-like low/high/peak intensity ratios

Can be achieved with something similar to:

low = @(p_cp) min(1,0.8*exp(0.8*(1-p_cp)));
peak = @(p_cp) min(max(0,exp((p_cp-1)*0.2)-1),1);
high = @(p_cp) 1- low(p_cp)-peak(p_cp);
figure, hold all
fplot(low, [0,4])
fplot(high, [0,4])
fplot(peak, [0,4])
figure, hold all
fplot(@(x) low(x)*x, [0,4])
fplot(@(x) high(x)*x, [0,4])
fplot(@(x) peak(x)*x, [0,4])

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