**Line Graphics Header File Format.**

The line graphics header file contains information about the data files corresponding to the given time. The first row of the file contains five floating point numbers. The second, third and fifth rows contain three integers each and the fourth row contains one integer. The numbers in the sixth through eleventh rows are all floating point numbers. The precise format of each piece of data is not critical, but the ordering of the data is critical. The file contains the following information.

xmin xmax ymin ymax time nx ny grid-size nibpt nps npv nxyfs nfs nxyfv nfv nlinks nmark

**Notes:**

- 1.
`xmin, xmax, ymin, ymax`define the domain size, and`time`is the current time of the simulation.- 2.
`nx-vector, ny-vector`are the number of grid points in each direction, and`grid-size`is the grid spacing.- 3.
`nibpts`is the number of immersed boundary points.`nps`is the number of scalar fields and`npv`is the number of vector fields defined at the immersed boundary points. These data are in the file`linepath/basename.i.xxxx`.- 4.
`nxyfs`are the number of grid points with field scalars, and`nfs`is the number of field scalars in the simulation. These data are contained in the file`linepath/basename.s.xxxx`.- 5.
`nxyfv`are the number of grid points with field vectors, and`nfs`is the number of field vectors in the simulation. These data are contained in the file`linepath/basename.v.xxxx`.- 6.
`nlinks`is the number of links defined in the file`linepath/basename.l.xxxx`, and`nmark`is the number of fluid markers defined in the file`linepath/basename.m.xxxx`.