| #### D.13.6.20 texDrawBasic Procedure from library `tropical.lib` (see tropical_lib). Usage: texDrawBasic(texdraw); list texdraw Assume: texdraw is a list of strings representing texdraw commands (as produced by texDrawTropical) which should be embedded into a texdraw environment Return: string, a texdraw environment enclosing the input Note: is called from conicWithTangents Example:
    LIB "tropical.lib";
    ring r=(0,t),(x,y),dp;
    poly f=x+y+1;
    string texf=texDrawTropical(tropicalCurve(f),list("",1));
    texDrawBasic(texf);
    ==>
    ==>     \begin{texdraw}
    ==>        \drawdim cm  \relunitscale 0.7 \arrowheadtype t:V
    ==>        %\linewd 0.05 \lpatt (0.1 0.4)
    ==>        %\move (-4 0) \avec (9 0) \move (0 -4) \avec (0 9)
    ==>        \linewd 0.1  \lpatt (1 0)
    ==>
    ==>
    ==>        \setgray 0.6
    ==>
    ==>
    ==>        \relunitscale 12
    ==>        \move (0 0) \fcir f:0 r:0.016
    ==>        \move (0 0) \rlvec (0 0.25)
    ==>        \move (0 0) \rlvec (0.25 0)
    ==>        \move (0 0) \rlvec (-0.25 -0.25)
    ==>
    ==>    %% HERE STARTS THE CODE FOR THE LATTICE
    ==>         \move (0 0) \fcir f:0.8 r:0.008
    ==>    %% HERE ENDS THE CODE FOR THE LATTICE
    ==>
    ==>     \end{texdraw}

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