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/usr/share/dx/samples/data/general.exampleheader is in dxsamples 4.4.0-3.

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# this general import format header describes the data which may be found
# in general.exampledata.  It is a deformed regular
# grid (with irregular positions and regular connections).  The first two
# numbers specify the x,y positions, and then there are two data fields 
# associated with those positions. They have been named "data1" and "data2".
# data1 consists of scalar values, and data2 consists of 2-vectors.
# The importer has been instructed to skip one line before beginning
# to read the data. The "locations" keyword is used as the field name for
# the x,y positions. This instructs the importer to use these values to
# to create a "positions" component in the output fields.
#
#
file = general.exampledata
grid = 4 4 
structure = 2-vector, scalar, 2-vector 
format = ascii
field = locations, data1, data2 
type = float, float, float
interleaving = field
header = lines 1