Ttgjyuk

I have this code:

begincenter
$left.% Use `left.` if don't want arrow on this side.
begintabularr r r 
toprule
 strength & region & comments \
midrule
 $H_B ll H_0$ & Landau levels \
$ H_B lessapprox H_0 $& $n$-mixing & $n$ not good\
 & $ell$-lmixing & $ell$ not good \
 $H_B ll B_0$ & Paschen-Back regime & $J$ noot good, $L$ and $S$ good \
 & Intermediate regime & $J$ and $I$ good, $F$ not good \
 & Zeeman effect & $F$ good \
 bottomrule
endtabular
quad
rightupdownarrow% Use `right.` if don't want arrow on this side.
rotatebox[origin=100]0Landau limit$
captionHAILO
endcenter

that generates:

What I would like:

• how can I make the entries in the first column (strengh, region, comments) centred with the columns contents?




• How can I have the Landau limit text at the top right corner of the table, like I drew with the red arrow?

Thanks.

How about this, based on bigdelim and makecell? The margin for the caption was obtained by trial and error – it depends on the text of the last column.

documentclassarticle
usepackagegeometry 
usepackageamssymb
usepackagecaption, booktabs, bigdelim, makecell%
renewcommandtheadfontnormalsizebfseries

begindocument

begintable[!htb]
centering
captionsetupmargin=0pt,28mm,skip=6pt
captionHAILO
begintabularr r r c@l
cmidrule[heavyrulewidth]1-3
 theadstrength & theadregion & theadcomments & rdelimupdownarrow7* & Landau limit \
cmidrule1-3
 $H_B ll H_0$ & Landau levels \
$ H_B lessapprox H_0 $& $n$-mixing & $n$ not good\
 & $ell$-lmixing & $ell$ not good \
 $H_B ll B_0$ & Paschen-Back regime & $J$ noot good, $L$ and $S$ good \
 & Intermediate regime & $J$ and $I$ good, $F$ not good \
 & Zeeman effect & $F$ good \
cmidrule[heavyrulewidth]1-3
endtabular
endtable

enddocument 

Without use of booktabs for the table (but clines instead) and with use of tikz with a n arrow that its height is found with tests:

documentclassarticle
usepackageamssymb
usepackagecaption
usepackagetikz
usepackagemultirow
begindocument
begincenter
$% Use `left.` if don't want arrow on this side.
begintabular[t]r r r c lcline1-3
 multicolumn1cstrength & multicolumn1cregion & multicolumn1ccomments &multirow6*begintikzpicturedraw[<->](0,0)--(0,2.9cm);endtikzpicture&Landau limit\
cline1-3
 $H_B ll H_0$ & Landau levels &&\
$ H_B lessapprox H_0 $& $n$-mixing & $n$ not good&&\
 & $ell$-lmixing & $ell$ not good &&\
 $H_B ll B_0$ & Paschen-Back regime & $J$ noot good, $L$ and $S$ good &&\
 & Intermediate regime & $J$ and $I$ good, $F$ not good &&\
 & Zeeman effect & $F$ good &&\
 cline1-3
endtabular
rotatebox[origin=100]0$
captionoftableHAILO
endcenter
enddocument

Output:

PS: Just as a start...

(Needed packages for OP's non working example:

usepackagebooktabs
usepackageamssymb
usepackagerotating

and

usepackagecaption

for the fix with captionoftable instead of caption

)

For the $left...$ effect one needs a [c] tabular. But to align the text, one need a [t] tabular. So I measured the [t] tabular and used raisebox and rule to fake a centered object with the right size. Finally, the top baseline of the tabular is actually toprule, so I had to put the text into the second line of another tabular.

documentclassarticle
usepackage[margin=1in]geometry
usepackageamssymb
usepackagecaption, booktabs, graphics%

begindocument

begincenter
sbox0begintabular[t]r r r
toprule
multicolumn1cstrength & multicolumn1cregion & multicolumn1ccomments \
midrule
 $H_B ll H_0$ & Landau levels \
$ H_B lessapprox H_0 $& $n$-mixing & $n$ not good\
 & $ell$-lmixing & $ell$ not good \
 $H_B ll B_0$ & Paschen-Back regime & $J$ noot good, $L$ and $S$ good \
 & Intermediate regime & $J$ and $I$ good, $F$ not good \
 & Zeeman effect & $F$ good \
 bottomrule
endtabular%
usebox0
raiseboxdimexpr 0.5ht0-0.5dp0 + 0.5dpstrutbox-0.5htstrutbox$left.rule0ptdimexpr 0.5ht0+0.5dp0rightupdownarrow$%
begintabular[t]l \Landau limit endtabular
captionoftableHAILO
endcenter

enddocument