how to plot measurements data

2018 2 5
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更新时间：2018 2 5
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I have a data set containing photometric measurement from galaxy, you can think of this like intensity. now, let's say I know that the data is coming from normal distribution and I know it's mean. how can I plot the curve that will fit to the distribution based on the data. or to be precise, I know that plotting the measurements suppose to look like this
when every color is different data, but when I'm trying to plot I get this is what I get
I upload the data file, Ignore I'd and z coulombs. the code I try is
x = linspace(4858-50/2,4858+50,numel(gp));
plot(x,gp)

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