[TeX] Editar árboles sintácticos en LaTeX usando Tikz

Explicado en estos dos enlaces:

https://tex.stackexchange.com/questions/172415/upside-down-syntax-trees-for-linguistics-with-horizontal-lines

\documentclass[tikz,border=5pt]{standalone}
\usepackage{forest}

% Node shape adapted from http://www.texample.net/tikz/examples/data-flow-diagram/
\makeatletter \pgfdeclareshape{myunderline}{
  \inheritsavedanchors[from=rectangle]
  \inheritanchorborder[from=rectangle]
  \foreach \from in
    {center,base,north,north east,east,south east,south,south west,west,north west}{
      \inheritanchor[from=rectangle]{\from}
  }
  \backgroundpath{
    \southwest \pgf@xa=\pgf@x \pgf@ya=\pgf@y
    \northeast \pgf@xb=\pgf@x \pgf@yb=\pgf@y
    % This can be improved by removing magic numbers
    \pgfpathmoveto{\pgfpoint{\pgf@xa}{\pgf@ya+1.75em}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{\pgf@ya+1.75em}}
 }
} \makeatother

\begin{document}
\begin{forest}
for tree={
    fit=band, % Isolates space above this node from siblings’ descendants
    no edge,
    % Uncomment the line below for the dotted edges
    % edge={dotted, semithick, gray!50, shorten <=8pt}, parent anchor=north,
    % This can be improved by reducing space between levels where edges are drawn
    inner sep=0pt, outer sep=0pt,
    l sep=0pt, s sep=6pt, text depth=0.5em, grow'=north,
    where level=0{} % No style for dummy root node
      {where n children=0
        {font=\bfseries,tier=word} % Leaves in bold on the same tier
        {font=\small,tikz={\node[draw, thick, myunderline, fit to tree] {};}} % Non-leaves
      }
}
% This can be improved by removing the need for a parent and sibling of the actual root
[,phantom[,phantom][OP
  [S/SN
    [Det [La] ]
    [N/Sust [novela] ]
    [CN/SAdj/Prop Sub Adj
      [PV/SV,
        [\textit{nexo} [que] ]
        [CI/SN [me] ]
        [N/V [ha regalado] ]
      ]
      [S/SN
        [Det [mi] ]
        [N [hermana] ]
      ]
    ]
  ]
  [PN/SV
    [N/V [est\'a] ]
    [Attrib/SAdj
      [N [ambientada] ]
    ]
    [CCL/SPrep
      [E [en] ]
      [T/SN
        [N [Australia\rlap.] ]
      ]
    ]
  ]
]]
\end{forest}
\end{document}

https://tex.stackexchange.com/questions/389510/put-trees-side-by-side-with-minipage-in-beamer