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What is wrong with this table please? Probably $si{degree}$. Thank you

documentclass[a4paper]{article}

usepackage{amsmath, amsthm, amssymb, mathtools}

usepackage{siunitx}

begin{document}

begin{table}[h!!]

small

renewcommand{arraystretch}{1.2}



setlengthtabcolsep{3pt}

begin{tabular*}{linewidth}{l@{extracolsep{fill}}c c cS[table-format=3.1]c}



De  &V (km) &S ($si{degree}$)     &P (min)    &Per (dny)\

hline

A &                 840     &   98,7&   101,5&  0,07048\

B &                 785     &   98,7&   101,4&  0,07041\

C   &   775-790&    98,6&   100,4&  0,06972\

D       &   612-640&    98,0&   97,1&   0,06743\



end{tabular*}

end{table}

end{document}

You are making the last column of your table as a SI (S) column, so you must wrap non-number contents in that column inside braces. Btw h!! is nonsense.

documentclass[a4paper]{article}

usepackage{amsmath, amsthm, amssymb, mathtools}

usepackage{siunitx}

begin{document}

begin{table}[h!]

small

renewcommand{arraystretch}{1.2}



setlengthtabcolsep{3pt}

begin{tabular*}{linewidth}{l@{extracolsep{fill}}c c c S[table-format=3.1]c}

De  & V (km) & S (si{degree}) & P (min)    &{Per (dny)}\

hline

A & 840     & 98,7 & 101.5 & 0,07048\

B & 785     & 98,7 & 101.4 & 0,07041\

C & 775-790 & 98,6 & 100.4 & 0,06972\

D & 612-640 & 98,0 & 97.1  & 0,06743

end{tabular*}

end{table}

end{document}

However it will change the commas to dots in the last column. To avoid this, read this question.

It seems to me that you are trying to make the second last column to be a SI column, so you should place S[table-format=3.1] somewhere else. My final answer:

documentclass[a4paper]{article}

usepackage{amsmath, amsthm, amssymb, mathtools}

usepackage[locale=FR]{siunitx}

begin{document}

begin{table}[h!]

small

renewcommand{arraystretch}{1.2}

setlengthtabcolsep{3pt}

begin{tabular*}{linewidth}{l@{extracolsep{fill}}c c S[table-format=3.1]c c}

De  & V (km) & S (si{degree}) & {P (min)}    & Per (dny)\

hline

A & 840     & 98,7 & 101,5 & 0,07048\

B & 785     & 98,7 & 101,4 & 0,07041\

C & 775-790 & 98,6 & 100,4 & 0,06972\

D & 612-640 & 98,0 & 97,1  & 0,06743

end{tabular*}

end{table}

end{document}

However, take care of the last column. I intentionally keep it, but you may want to reduce its size.

i would wrote your table narrower:

and for last three columns use S column type:

documentclass[a4paper]{article}

usepackage{amsthm, amssymb, mathtools}% mathtools load `amsmath

usepackage[locale=FR]{siunitx}



begin{document}

    begin{table}[h!]

renewcommand{arraystretch}{1.1}

begin{tabular}{l c

                S[table-format=2.1]

                S[table-format=3.1]

                S[table-format=1.5]}

De  & V (km) & S {(si{degree})} & {P (min)}    & {Per (dny)}\

    hline

A & 840     & 98,7 & 101,5 & 0,07048\

B & 785     & 98,7 & 101,4 & 0,07041\

C & 775-790 & 98,6 & 100,4 & 0,06972\

D & 612-640 & 98,0 & 97,1  & 0,06743

end{tabular}

    end{table}

end{document}

note curly braces around column headers in S columns!