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I created the Petersen diagram relative to all the Double Mode High Amplitude{\delta} Scuti stars listed in the AAVSO's International Variable Star Index upto date December 29, 2015. For the first time I noticed that the ratio betweenthe two periods P1/P0 seems in evident linear relation with the duration of theperiod P0, a finding never explicitly described in literature regarding thistopic.

Analysis of the Petersen Diagram of Double-Mode High-Amplitude {\delta} Scuti Stars