Here are some published examples that also fall within these parameters. Textile Arts currently has a djoinamas with the measurements of 155 x 114 cm. A size definition of too large a range might be less effective or even meaningless. These are typical bedsheet size, over two meters by about a meter and a half and are not considered here. I think it is important to differentiate between these two traditions of embroidery.
Size is the clearest indication.
The Ottoman niche form that will be questioned later is 109 x 81 cm. I don't know of further existing Persian and Ottoman and Mughal examples of original niche form embroideries on light weight material. It seems clear that a larger database on this form is needed. A question now arises as to whether pieces with an embroidered field under the arch should be considered separately. I believe that they should be considered together.