figure
hold

monthNum = 10;
for i=1:length(filename)
    a = datestr(WSStruct(i).timeStamp,5);
    b = str2num(a);
    mRows = find(b == monthNum);
    if length(mRows) > 0
        waterfall(WSStruct(i).freqVector,WSStruct(i).timeStamp(mRows),WSStruct(i).spectrum(mRows,:))
    end
end
datetick('y',2)