A magnetic resonance apparatus has at least one section of an optical fiber with at least one Bragg grating having a Bragg wavelength. The ECG signal can be identified, wherein the ECG signal is affected by baseline wander noise. A loading and unloading station has a billet loading side and a container unloading side. The composition also includes a foam forming material, above 9 % by weight of the composition with at least a part of the foam forming material being maintained in suspension in the composition until after the composition is dispensed from the aerosol container. It displays the direction the turf is to be cut on the day it is being cut. The resulting polyimide materials have been found to provide advantageous properties particularly useful for electronics type applications.