Creates a template binding a label to a set of chunk options. Every chunk that references the template label will have the specificed set of options applied to it.
opts_templateAn object of class list of length 6.
# NOT RUN {
opts_template$set(myfigures = list(fig.height = 4, fig.width = 4))
# later you can reuse these chunk options by 'opts.label', e.g.
# <<foo, opts.label='myfigures'>>=
# the above is equivalent to <<foo, fig.height=4, fig.width=4>>=
# }
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