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Eye Aperture isn't taking place at values of my interest

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Hi , In the image attached, its a combination of 8 eye diagrams. I am using eye aperture calc function for automatic generation of the mask.  My desired vref is 660mv, VHiDC = 785mv (verf+125mv) & VHiAC = 810mv(Vref+150mv). Eye aperture fails to evaluate at these values because eye opening maximum is 741mv where V1 & H1 intersects, where  V2 &H1 intersects it can evaluate. But it evaluate only at V1 crossing not V2. Is there any way to evaluate and create mask connecting  between 810 mv & 785mv ?

If i try have custom mask of my own, tool let me select only one mask at a time. Is there any way to apply custom mask to all 8 eye diagrams in one go?


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