How to use baseline correction function for single mass intensity values?

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Novice Geek 2014-3-15

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https://ww2.mathworks.cn/matlabcentral/answers/121664-how-to-use-baseline-correction-function-for-single-mass-intensity-values

sample5bi3neg_4 (17) - 424.42 u.txt

Hello, I have an imaging dataset in the form of multiple text files. Each text file represents the intensity values for a specific mass for all the pixels. In each text file there are some header lines and then 3 columns comprising the coordinates and intensity values(x,y, intensity) for that specific mass. Now I want to perform baseline correction (using function msbackadj and other pre-processing steps on this file. But I always get an error, which I guess is due to the manner in which the data has been organized. Can anyone help me here? A sample file is attached.