如何獲得環繞圖形旁邊的垂直空間？

Question

我不明白為什麼用句點 <.> 註解和取消註解該行會導致間距從包裹圖形上方移動到其旁邊。

我想要旁邊的空間。

我只能在這段時間裡得到我想要的東西。

任何幫助將不勝感激。

\documentclass[letterpaper, 12pt]{memoir}
\usepackage{wrapfig}
\usepackage{graphicx}
%\graphicspath{{img/}}

\begin{document}% document begins
  %
\subparagraph{Download the Forfeiture Field Map}There are 3 different versions %of the map

.% With this line commented, The wrapped text and figure is spaced down 3 in.  %But if its active, just the text is spaced down 3 in(This is the desired %behaviour).

\begin{wrapfigure}{r}{0.5\textwidth}
\includegraphics[width=.5\textwidth]{CollectorChooseMap.png}
\end{wrapfigure}
\vspace{3in}

Push Download

\end{document}