nch1 = ch1 - ( (ch10+ch21)/2 ) Label Fp1   
nch2 = ch2 - ( (ch10+ch21)/2 ) Label Fz    
nch3 = ch3 - ( (ch10+ch21)/2 ) Label F3    
nch4 = ch4 - ( (ch10+ch21)/2 ) Label F7    
nch5 = ch5 - ( (ch10+ch21)/2 ) Label FT9   
nch6 = ch6 - ( (ch10+ch21)/2 ) Label FC5   
nch7 = ch7 - ( (ch10+ch21)/2 ) Label FC1   
nch8 = ch8 - ( (ch10+ch21)/2 ) Label C3    
nch9 = ch9 - ( (ch10+ch21)/2 ) Label T7    
nch10 = ch10 - ( (ch10+ch21)/2 ) Label M1  
nch11 = ch11 - ( (ch10+ch21)/2 ) Label CP5 
nch12 = ch12 - ( (ch10+ch21)/2 ) Label CP1 
nch13 = ch13 - ( (ch10+ch21)/2 ) Label Pz  
nch14 = ch14 - ( (ch10+ch21)/2 ) Label P3  
nch15 = ch15 - ( (ch10+ch21)/2 ) Label P7  
nch16 = ch16 - ( (ch10+ch21)/2 ) Label O1  
nch17 = ch17 - ( (ch10+ch21)/2 ) Label Oz  
nch18 = ch18 - ( (ch10+ch21)/2 ) Label O2  
nch19 = ch19 - ( (ch10+ch21)/2 ) Label P4  
nch20 = ch20 - ( (ch10+ch21)/2 ) Label P8  
nch21 = ch21 - ( (ch10+ch21)/2 ) Label M2  
nch22 = ch22 - ( (ch10+ch21)/2 ) Label CP6 
nch23 = ch23 - ( (ch10+ch21)/2 ) Label CP2 
nch24 = ch24 - ( (ch10+ch21)/2 ) Label Cz  
nch25 = ch25 - ( (ch10+ch21)/2 ) Label C4  
nch26 = ch26 - ( (ch10+ch21)/2 ) Label T8  
nch27 = ch27 - ( (ch10+ch21)/2 ) Label FT10
nch28 = ch28 - ( (ch10+ch21)/2 ) Label FC6 
nch29 = ch29 - ( (ch10+ch21)/2 ) Label FC2 
nch30 = ch30 - ( (ch10+ch21)/2 ) Label F4  
nch31 = ch31 - ( (ch10+ch21)/2 ) Label F8  
nch32 = ch32 - ( (ch10+ch21)/2 ) Label Fp2