A tee-off golfing mat which includes an upper layer and which positions the upper layer on a distance D from a reference layer. According to the invention the flotation device comprises attachment means and a holder that is resistant in regard of spray water and atmospheric humidity. The electrolyte powder with the metal-oxide electrode body was pressed to form a pressed electrolyte body containing the metal-oxide electrode body. The thickener may serve as a binder if sufficient amounts are used. Corresponding methods and systems are also disclosed. ; and performing a second heat treatment process on the substrate in a state where the inside of the substrate process chamber is maintained in water vapor atmosphere and depressurization atmosphere at the temperature ranging from 900\xb0 C.