An electronic card with a programmable magnetic band which operates to emulate a magnetic stripe on a payment card. The optical waveguide is configured such that linear cores in a lattice form are held between an under cladding layer and an over cladding layer both in a sheet form. In the portion of the plant arranged downstream of the compressor, at least one turbo-expander and at least one valve are installed in parallel so that they cooperate with each other and are controlled by electronic devices so as to protect the compressor and to produce useful energy during recirculation mode. In addition, the separate device may have a battery to keep it operational even when the host system is non-operational. The document to be printed is printed.