Try this for each of the vectors:
minValue = 600; % Or whatever you want.
maxValue = 1000; % Or whatever you want.
indexesInRange = data > minValue & data < maxValue;
subVector = data(indexesInRange);
That will, for a vector called data, extract all the values between minValue (which you can define to be 600) and maxValue (which you can define to be 1000) into a new vector called subVector. Do this 10 thousand times for each of the vectors (most likely done in a loop).
