[Tex/LaTex] label the Figures as Figure 1.0, Fig 1.5, Fig 2.0, fig 2.5, .. ( in article format)

floatsnumbering

I'm typing up Topological Graph Theory pictures, and I have two pics that correspond to each graph (13 graphs). I would like to be able to reference my figures as in the title, but idk how to set a counter to do that.

\begin{document}


\section{Figures for Proposition 1}


\begin{figure}[H]
\centering
\includegraphics[width=0.7\linewidth, height=0.2\textheight]{../GeoGebra/ItiiP3L/D1}
\caption{\Dons has a unique embedding into \Sph, up to equivalence, by the symmetry of $K_{3,1,1}$.}
\label{fig:D1}
\end{figure}

\begin{figure}[H]
\centering
\includegraphics[width=0.7\linewidth, height=0.2\textheight]{../GeoGebra/ItiiP3L/D1minors}
\caption{\Dons has only two equivalence classes of edges; those that are incident to a vertex of degree 2, and those that are not.}
\label{fig:D1minors}
\end{figure}






\begin{figure}[H]
\centering
\includegraphics[width=0.7\linewidth, height=0.2\textheight]{../GeoGebra/ItiiP3L/D2}
\caption{\Dtws has four distinct embeddings into \Sph, up to equivalence.}
\label{fig:D2}
\end{figure}


\begin{figure}[H]
\centering
\includegraphics[width=0.7\linewidth, height=0.2\textheight]{../GeoGebra/ItiiP3L/D2minors}
\caption{\Dtws has only two equivalence classes of edges; those that are contained by $K_4$, and those that are not.}
\label{fig:D2minors}
\end{figure}



\begin{figure}[H]
\centering
\includegraphics[width=0.7\linewidth, height=0.2\textheight]{../GeoGebra/ItiiP3L/D3}
\caption{\Dths has a unique embedding into \Sph, up to equivalence.}
\label{fig:D3}
\end{figure}


\begin{figure}[H]
\centering
\includegraphics[width=0.7\linewidth, height=0.2\textheight]{../GeoGebra/ItiiP3L/D3minors}
\caption{\Dths has seven equivalence classes of edges, as highlight in Figure \ref{fig:D3}.}
\label{fig:D3minors}
\end{figure}



\end{document}

When configured, this reads as Figure 1, Figure 2, Figure 3, Figure 4, Figure 5, Figure 6.
However, these six figures refer to only three graphs. It would be easier for readers of my paper if they were labeled in some way similar to Figure 1.0, Figure 1.5, Figure 2.0, Figure 2.5, Figure 3.0, Figure 3.5, or even Figure 1 A, Figure 1 B, Figure 2 A, Figure 2 B, Figure 3 A, Figure 3 B.

Best Answer

It may make more sense here to use a 1A, 1B, 2A, 2B, ... numbering, since the 0 and 5 doesn't seem to have any bearing on the contents:

enter image description here

\documentclass{article}
\usepackage{graphicx}

\begin{document}

\listoffigures

\section{Figures for Proposition 1}

\begin{figure}[t]
  \centering
  \includegraphics[width=0.7\linewidth, height=0.2\textheight]{example-image-a}
  \renewcommand{\thefigure}{\arabic{figure}A}
  \caption{Caption one}
\end{figure}
\begin{figure}[t]
  \centering
  \includegraphics[width=0.7\linewidth, height=0.2\textheight]{example-image-b}
  \addtocounter{figure}{-1}\renewcommand{\thefigure}{\arabic{figure}B}
  \caption{Caption two}
\end{figure}
\begin{figure}[t]
  \centering
  \includegraphics[width=0.7\linewidth, height=0.2\textheight]{example-image-c}
  \renewcommand{\thefigure}{\arabic{figure}A}
  \caption{Caption three}
\end{figure}
\begin{figure}[t]
  \centering
  \includegraphics[width=0.7\linewidth, height=0.2\textheight]{example-image-b}
  \addtocounter{figure}{-1}\renewcommand{\thefigure}{\arabic{figure}B}
  \caption{Caption four}
\end{figure}
\begin{figure}[t]
  \centering
  \includegraphics[width=0.7\linewidth, height=0.2\textheight]{example-image-c}
  \renewcommand{\thefigure}{\arabic{figure}A}
  \caption{Caption five}
\end{figure}
\begin{figure}[t]
  \centering
  \includegraphics[width=0.7\linewidth, height=0.2\textheight]{example-image-a}
  \addtocounter{figure}{-1}\renewcommand{\thefigure}{\arabic{figure}B}
  \caption{Caption six}
\end{figure}

\end{document}

For the first-of-two figures, I append A to \thefigure. For the second-of-two figures, I unstep the figure counter (in order to maintain the same number) and append B to it.

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