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				b			c1			c2				b			c1			c2
Screen size
(diagonal)		Projection distance					Screen		Screen			Projection distance				Screen			Screen
		PLQ			PD[		height		height			PLQ		PD[		height			height
type	m	m	inch		m	inch	cm	inch	cm		inch	m	inch	m	inch	cm		inch	cm		inch
(inch)
30			34			41	41	16	5		2		38		45	39		15			0
40			46			55	55	22	6		2		51		60	51		20			
50			58			69	69	27	8		3		64		76	64		25			
60			70			83	82	32	9		4		77		91	77		30			
70			82			97	96	38	11		4		90		106	90		35			
80			94			112	110	43	12		5		103		122	103		41			
90			106			126	123	49	14		5		116		137	116		46			
100			118			140	137	54	15		6		129		153	129		51			
120			142			168	165	65	18		7		155		183	154		61			
150			178			211	206	81	23		9		194		229	193		76			
200			237			281	274	108	30		12		259		306	257		101			
250			297			352	343	135	38		15		324		383	322		127			
300			357			422	411	162	46		18		389		460	386		152			

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