A novel electronic apparatus includes a main unit of the apparatus and a detachable control panel that can communicate with the main unit of the apparatus. In particular, a multicarrier modulation system uses messages that are sent from the receiver to the transmitter to exchange one or more sets of optimized communication parameters. At least one deposit-withdrawal shuttle moves along the cell mouths and has handling means for taking and depositing load units at the head of the rows. The method further includes indicating that the surface estimation value is to be updated when a yaw rate error value is greater than the threshold yaw rate error value. The light redirecting film has an average effective transmission that is not less than about 1.