spacing - Align (center) header row in table - TeX - LaTeX Stack

I use @{\hskip 50pt} to separate columns in my table. The problem which arises is that I add this extra space after a multicolumn. This also moves the header row so that it is no longer centred. Is

r - flextable: align ONLY header row to center - Stack Overflow

horizontal alignment - How to align table headers differently than

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tables - Spacing in a multirow - TeX - LaTeX Stack Exchange

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Vertical alignment of text in a table in LaTeX - Stack Overflow

Vertical alignment of text in a table in LaTeX - Stack Overflow

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