div class=ts-pagebuttonPage 1button div class=ts-image a href=https:reader043vdocumentinreader043viewer20220306115adaed6c7f8b9a53618d472dhtml5page1jpg target=_blank amp-img class=ts-thumb alt=Page 1: by the down track and cross track dimensions of the magnetic units constituting the medium The medium may be represented by a brick wall model with bricks representing fixed magnetic src=https:reader043vdocumentinreader043viewer20220306115adaed6c7f8b9a53618d472dhtml5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divdivdiv class=ts-pagebuttonPage 2button div class=ts-image a href=https:reader043vdocumentinreader043viewer20220306115adaed6c7f8b9a53618d472dhtml5page2jpg target=_blank amp-img class=ts-thumb alt=Page 2: by the down track and cross track dimensions of the magnetic units constituting the medium The medium may be represented by a brick wall model with bricks representing fixed magnetic src=https:reader043vdocumentinreader043viewer20220306115adaed6c7f8b9a53618d472dhtml5thumbnails2jpg width=142 height=106 layout=responsive amp-imga divdivdiv class=ts-pagebuttonPage 3button div class=ts-image a href=https:reader043vdocumentinreader043viewer20220306115adaed6c7f8b9a53618d472dhtml5page3jpg target=_blank amp-img class=ts-thumb alt=Page 3: by the down track and cross track dimensions of the magnetic units constituting the medium The medium may be represented by a brick wall model with bricks representing fixed magnetic src=https:reader043vdocumentinreader043viewer20220306115adaed6c7f8b9a53618d472dhtml5thumbnails3jpg width=142 height=106 layout=responsive amp-imga divdiv