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/usr/lib/R/site-library/phylobase/nexusfiles/treeRoundingError.nex is in r-cran-phylobase 0.8.2-1.

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#NEXUS

BEGIN TAXA;
	DIMENSIONS NTAX=4;
	TAXLABELS
		spA spB spC spD
	;

END;


BEGIN CHARACTERS;
	TITLE  'Morphology';
	DIMENSIONS NCHAR=1;
	FORMAT DATATYPE = CONTINUOUS;
CHARSTATELABELS 
		1 testTest;
MATRIX
	spA 0.6263965
	spB 0.7741235
	spC 1.0180075
	spD 1.0856245
;

END;

BEGIN TREES;
	TRANSLATE
	1 spA,
	2 spB,
	3 spC,
	4 spD;
   TREE testTree = (1,(2,(3,4)));
END;