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Subject: Import/Load data
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I have the following data series with 4 variables:
X        Y       Z      S     
6	6		
5.6	5.7		
4.9	5		5.4
4.9	5		5.1
5.3	5.2		5.7
5.5	5.6		5.9
4.7	4.9		5.2
4.7	4.9		5.1
4.5	4.6	4.7	
4.2	4.7	4.9	
4.5	4.5	4.5	
4.4	4.8	4.6	
4.5	4.6	4.7	
4.6	4.8	4.8	
5.1	5.2	5.4	5.2
4.7	4.8	4.8	
4.9	4.9	5.2	5.2
4.5	4.6	4.7	
4.9	4.9	5.1	5.1
4.4	4.7	4.9	
4.3	4.6	5	
4.5	4.6	5	
4.7	4.8	5.4	
4.1	4.5	4.4	
4.5	4.8	4.8	
4.7	4.8	5.2	5
4.2	4.7	4.5	
4.6	4.8	4.8	
4.5	4.8	4.7	
4.6	4.7	5	
4.6	4.9	4.7	
4.5	4.8	4.6	
4.6	4.8	4.8	
4.5	4.6	4.6	
4.7	4.7	4.9	
4.3	4.5	4.7	
4	4.5	4.8	
4.4	4.4	4.8	
4.3	4.6	5	
4.4	4.6	4.7	
4.9	4.9	5.2	5
4.4	4.7	4.9	
4.3	4.5	4.7	
4.4	4.5	4.8	
4.1	4.5	4.8	
4.7	5.2	5.2	5.1
4.3	4.6	5	5
4.9	4.8	5.3	5.2
4.3	4.5	4.8	
5.1	5.3	5	5
5.3	5.3	5.6	5.5
4.2	4.7	4.8	
4.3	4.5	4.8	
4.5	4.7	5.2	
4.1	4.7	5	
4.4	4.7	4.7	
4.5	4.8	4.8	
4.6	4.8		4.8
3.8	4.5		4.8
6	6.1		6.3
4.8	4.8		5
5.8	5.9		6.1
4.3	4.4		4.8
5	5.2		5.2
4.7	4.9		5
5.1	5.2		5.4
4.9	5		5.1
4.6	4.5		4.8
4.1	4.7		5
4.7	4.7		5
5.1	5.2		5.3
4.8	4.9		4.9
5	5.2		5.1
4.6	4.8		4.8
4.8	4.9		5
5.2	5.4		5.3
5.3	5.4		5.5
4.7	4.7		5
	4.9		5
	5		5.1
4.2	4.9		5.1
	4.9		5.1
3.9			4.9
4	4.6		4.9
3.7			4.8
	5		5.1
	4.7		4.8
3.9			4.8
	4		5
	4.7		5.1
	4.7		4.8



and I want import or load these data keeping the empty cells of each variable in order to analyze statistical relations between them. 
When I use import option missing data are replaced by NaN :(. 
I have used command dlmread but it joined data from variable S  on Z :((