I want to reproduce the following diagram in Tikz.
LaTeX code of my MWE is below:
\documentclass[tikz]{standalone}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\draw [-latex, thick] (0, 0) -- (0, 6) node [above] {\Large{$e$}};
\draw [-latex, thick] (0, 3) -- (6, 3) node [right] {\Large{$\widehat{Y}$}};
\draw [thick] (0, 0.5) -- (5, 4);
\draw [thick] (0, 1.75) -- (5, 5.25);
\end{tikzpicture}
\end{document}
I wonder how to fill specified area by dotted points. Any help will be highly appreciated. Thanks
Edited
How about this one?