A method for producing a high purity, high quality amide compound, particularly a lactam. The raw material is spray-dried to obtain precursor powder, which is calcined to form ultra fine Titransition metal complex oxide and is then mixed with nano-sized carbon particles and subjected to reduction and carburization in a non-oxidizing atmosphere. Each cell includes at least a first grating structure formed by a first process and a second grating structure formed by a second process and wherein each cell has a predefined offset between such each cell’s first and second grating structures. Each file is accessible using an identifier of the camera and a time interval.