The sigma that I got from fitgmdist seems small

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ELI
ELI 2015-5-7
编辑： ELI 2015-5-7
Hi, I've used fitgmdist to fit 3 gaussians to my variable, and the sigma seems very small. The variable is attached. After histogram, the function looks:
[binsAll, centerAll]=hist(tumorFu,128);
figure;plot(centerAll,binsAll,'r');
I used fitgmdist using:
obj = fitgmdist(tumorFu,3);
and then plotted it with:
figure;ezplot(@(x) pdf(obj,x));
Although the plot looks alright and also the means, the sigma that I got is 10th more little. What do I understand wrong?

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