the different heights of the warp threads relative to the weft threads the following are indicated on said reference axis h r fixed height at which the tension warp thread s 1 of the top fabric and any dead pile warp threads p 9 which are bound into the top fabric are situated during the weaving h r 39 fixed height at which the tension warp thread height s 2 of the bottom fabric and any dead pile warp threads which are bound into the bottom fabric are situated during the weaving h b1 pick height of the top weft thread at the highest position of the weft insertion device h b2 pick height of the bottom weft thread at the highest position of the weft insertion device h o1 pick height of the top weft thread at the lowest position of the weft insertion device h o2 pick height of the bottom weft thread at the lowest position of the weft insertion device h 1 height to which one binder warp b 1 of the top fabric is taken for the insertion in that fabric h 2 height to which the other binder warp b 2 of the top fabric is taken for the same insertion in that fabric h 1 39 height to which one binder warp b 3 of the bottom fabric is taken for the insertion in that fabric h 2 39 height to which the other binder warp b 4 of the bottom fabric is taken for the same insertion in that fabric h 3 height to which an active pile thread in the top fabric is taken to.