How to submit a document or request an estimate To submit a document for an order or estimate, please e-mail your documents and any questions or requests to inbox@supernatantcommunications.com. The total size of attachments is limited to 20 MB. Format Because most of our clients submit their text as an MS-Word document (doc or docx file), this is our preferred format. However, we can work with rich text files (rtf) and plain text files (txt), too. For tables and figures, Excel, PowerPoint, and standard image file formats are acceptable. Submission process After you submit your order by e-mail, we will acknowledge receipt of your documents and inform you of the estimated cost and/or the date when the finished document will be returned to you.