fld=readbin(fld,[nx 6 nx],1,'real*8');

tmp=nan*ones(nx*4,nx*3);
tmp(ix1,iy1)=squeeze(fld(:,1,:));
tmp(ix2,iy1)=squeeze(fld(:,2,:));
tmp(ix2,iy2)=squeeze(fld(:,3,:));
tmp(ix3,iy2)=squeeze(fld(:,4,:));
tmp(ix3,iy3)=squeeze(fld(:,5,:));
tmp(ix4,iy3)=squeeze(fld(:,6,:));

mypcolor(tmp'); colorbar