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		| Paper: | 
		OSIRIS Multi-Object Spectroscopy: Mask Design Process | 
	 
	
		| Volume: | 
		507, Multi-Object Spectroscopy in the Next Decade: Big Questions, Large Surveys, and Wide Fields | 
	 
	
		| Page: | 
		191 | 
	 
	
		| Authors: | 
		Gómez-Velarde, G.; García-Alvarez, D.; Cabrerra-Lavers, A. | 
	 
	
	
		| Abstract: | 
		The OSIRIS (Optical System for Imaging and Low-Intermediate Resolution Integrated Spectroscopy) instrument at the 10.4 m GTC has offered a multi-object spectroscopic mode since March 2014. In this paper we describe the detailed process of designing a MOS mask for OSIRIS by using the Mask Designer Tool, and give some numbers on the accuracy of the mask manufacture achievable at the telescope for its scientific use. | 
	 
	
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