CUSIP No. 976391300 SCHEDULE 13G Page 11 of 11

Exhibit 1

JOINT FILING AGREEMENT

PURSUANT TO RULE 13D-1(k)1

The undersigned acknowledge and agree that the foregoing Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments and for the completeness and accuracy of the information concerning him or it contained therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

Date: October 3, 2014

INDABA CAPITAL MANAGEMENT, L.P.
By:	/s/ Hank Brier
	Name: Hank Brier
	Title: General Counsel

INDABA PARTNERS, LLC
By:	/s/ Hank Brier
	Name: Hank Brier
	Title: General Counsel

IC GP, LLC
By:	/s/ Hank Brier
	Name: Hank Brier
	Title: General Counsel

INDABA CAPITAL FUND, L.P.
By:	/s/ Hank Brier
	Name: Hank Brier
	Title: General Counsel

/s/ Derek C. Schrier

DEREK C. SCHRIER