This function is created to simplify the convolution of a spectrum to reduce its resolution.
To use this function it is sufficient to download the file and call it as an external function. The input values are:
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x: x array.
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y: y array.
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Final_res: Final resolution (multiple of the original resolution).
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Inital_x: Start x (multiple of the final resolution).
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Final_x: Final x (multiple of the final resolution).
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f_type: Function used (sinc, gauss, square).
It returns the low resolution x and y arrays
