Question: I recently moved over to `luaLaTeX` from `pdfLaTeX` which means I am no longer quite so font-constrained. I found [this answer](https://tex.stackexchange.com/a/431804/7880) which shows how to load this alphabet of upright Greek letters instead of the math alphabet. I *don't* want to load them in place of the math alphabet, I want that to stay italic. I want to use them for commands like `\chemalpha` to replace the commands from the `chemgreek` package. Alternatively, making `chemgreek` use this alphabet would work, though I can manually write each command if need be.

I made this example, but it doesn't actually work, it replaces the wrong alphabet and the  `\newcommand{\chemalpha}{α}` don't actually DO anything as it has no idea what α is.

```
\documentclass{article}

\usepackage[math-style=upright]{unicode-math}
\setmathfont{Latin Modern Math}
\setmathfont[range=up/{Latin,latin,Greek,greek}]{CMU Serif Upright Italic}
\usepackage{cfr-lm}

\newcommand{\chemalpha}{α}
\newcommand{\chembeta}{β}
\newcommand{\chemeta}{η}
\newcommand{\chemkappa}{κ}

\begin{document}
\( \alpha + \beta = \pi \)

\([^{\text{n}}\text{Bu}_4 \text{N}]_2 [(\text{UO}_2 )_2 (µη^{2}:η^{2}O_2 )(NO_3 )_2 (µ\text{Au(CN)}_2 )_2 ]\) 

\chemalpha
\chembeta
\chemeta
\chemkappa

\end{document}

```

Answer: 
I'd strive for making the header just two rows, smashing it so its depth is not seen.

```
\documentclass{report}

\usepackage{booktabs}

\newcommand{\smashedcell}[2]{%
  \smash{\begin{tabular}[t]{@{}#1@{}}#2\end{tabular}}%
}

\begin{document}

1. booktabs example: Last column head fits on single line

\begin{center}
\begin{tabular}{@{}llr@{}}
\toprule
\multicolumn{2}{c}{Item} \\
\cmidrule(r){1-2}
Animal & Description & Price (\$)\\
\midrule
Gnat      & per gram  & 13.65 \\
          & each      &  0.01 \\
Gnu       & stuffed   & 92.50 \\
Emu       & stuffed   & 33.33 \\
Armadillo & frozen    &  8.99 \\
\bottomrule
\end{tabular}
\end{center}

2. Modification: Last column head requires 3 lines

\begin{center}
\begin{tabular}{@{}llr@{}}
\toprule
\multicolumn{2}{c}{Item} & \smashedcell{c}{Price in\\Dollars}\\
\cmidrule(r){1-2}
Animal & Description & \\
\midrule
Gnat      & per gram  & 13.65 \\
          & each      &  0.01 \\
Gnu       & stuffed   & 92.50 \\
Emu       & stuffed   & 33.33 \\
Armadillo & frozen    &  8.99 \\
\bottomrule
\end{tabular}
\end{center}

\end{document}

```

[![enter image description here](https://i.stack.imgur.com/kidgt.png)](https://i.stack.imgur.com/kidgt.png)
Not sure if what I'm doing here is right, pls strike if not.

Both answers to my question work, and gave me what I needed, but it took me many hours over several days to understand them. Here is what I needed to learn.

The TeX Book C18 Fine Points of Mathematics Typing: \smash ``makes the height and depth zero.''

C11 Boxes ``TeX doesn't have any idea where the ink will go---only the output device knows this.''

TeX works with boxes that have a reference point, a baseline, a height, and a depth. Boxes for letters, rules, etc are joined to form lines of text, which are vertically to create a page of text.

The height (depth) of a line of text is the max of the heights (depths) of the heights (depths) of the boxes concatenated, so my three line heading kicks up the height of the line containing it by a factor of about 3.

\smash changes the height and depth to zero. TeX, oblivious to the content of the heading box, leaves the height of the line containing it to what the height would be without it. This solves my problem.