Name of the file. If NULL, all example files are listed.
Examples
# get a list all example filesfp_example()#> [1] "gullars_period1.FP3"# get the path for this particular filefp_example("gullars_period1.FP3")#> [1] "/home/runner/work/_temp/Library/fpod/extdata/gullars_period1.FP3"