curve fitting - Python fit and chi square comparison - Stack Overflow

I want to know which functions fits better to my data by calculating the chi square value and then compare it. The data i have could like either like a gaussian or kind of like an horizontal line

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curve fitting - Python fit and chi square comparison - Stack Overflow

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python - Generating chi_squared using best fit - Stack Overflow

Curve fitting in Python, need almost exact match of the shape of