The :command:`c3k_to_specint` tool extracts a series of flux spectra from a data file in C3K format, and writes them to :f-schema:`specint` files. It accepts the following command-line arguments:
.. program:: c3k_to_specint
.. option:: <c3k_file_name> Name of input C3K file.
.. option:: <specint_prefix> Prefix of output :f-schema:`specint` files; these will have the name :file:`<specint_prefix>-NNNNNNNN.h5`, where :file:`NNNNNNNN` is the zero-padded index of the spectrum (starting at 1).