For a text data file with <em>n</em> data entries where the input domain has <em>N</em> dimensions and a <em>input_param</em> parametrization and the output domain has <em>P</em> dimensions and a <em>output_param</em> parametrization, our file format is the following:
\verbatim
#DIM N P
#PARAM_IN %input_param%
#PARAM_OUT %output_param%
#VS [0|1|2] (P times)
x_{1,1} ... x_{1,N} y_{1,1} ... y_{1,P}
...
x_{i,1} ... x_{i,N} y_{i,1} ... y_{i,P}
...
x_{n,1} ... x_{n,N} y_{n,1} ... y_{n,P}
\endverbatim
Vertical segments are not defined if VS is 0. For a VS of 1, each sample as a radius associated for the associated dimension. If VS is 2, each sample has a min and max segment value for the associated dimension.