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Monthly variation of different spread F types observed (a) from Nicosia on 2009 (b) from Nicosia on 2015 (c) from Nicosia on 2016 (d) from Athens on 2009 (e) from Athens on 2015 (f) from Athens on 2016 (g) from Pruhonice on 2009 (h) from Pruhonice on 2015 (i) from Pruhonice on 2016.
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