I need to put a single dot below some letters as diacritical signs. That's what I found \d{<text>} for. Though, the dot is not placed at the exact same height/depth below every letter (indeed it's Greek letters). Just try the following MWE.

I've already found some kind of solution for my problem (https://tex.stackexchange.com/a/437174/164672).

Though, this is not very comfortable. So my question is: Is there an easier way to adjust the height/depth of these dots below the greek letters? (Perhaps defining a new length that can be changed later...)

\documentclass[10pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[greek, english]{babel}
\newcommand{\greek}[1]{\begin{otherlanguage*}{greek}#1\end{otherlanguage*}}
\begin{document}
\d{\greek{a}} \d{\greek{b}}
\end{document}


Following the response that you linked to, if you want to be able to change the gap between the diacritical marks and the letter, you can use stackengine package. Here is a minimal working example:

\documentclass[10pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[greek, english]{babel}
\usepackage{stackengine}
\newcommand{\greek}[1]{\begin{otherlanguage*}{greek}#1\end{otherlanguage*}}
\begin{document}

\def\alphael{\stackinset{c}{0pt}{b}{-7.5pt}{.}{\greek{a}}}
\def\betael{\stackinset{c}{0pt}{b}{-5pt}{.}{\greek{b}}}
\def\deltael{\stackinset{c}{0pt}{b}{-7.5pt}{.}{\greek{d}}}
\def\gammael{\stackinset{c}{0pt}{b}{-5pt}{.}{\greek{g}}}

\alphael \betael \deltael \gammael

\end{document}


Which yields the following output:

Your original MWE produces the following:

• Thanks for your quick response. How did you find these values (-7.5pt and -5 pt)? If I use the template that my publisher gave me, your solutions does not work anymore. The dots are not typeset at the same height/depth. I guess this is due to a different font, that is used in the template. Isn't there a sfaer way to really make sure that the dots are all at the same level --- indepent on what font is used? Maybe something that uses the current baseline... – rsa-krypto Nov 14 '18 at 14:29
• @rsa-krypto Well, as the output shows, in terms of usefulness, this answer solves your problem but still needs a few setups based on your template and your font. Do you need to add diacritical signs in this way to a large set of letters? – Sina Ahmadi Nov 15 '18 at 12:54
• In total it's 95 letters. Some of them contain diacritics above. – rsa-krypto Nov 15 '18 at 13:04