The IHFC welcomes your proactive contributions to the international heat flow database. To prepare your data, we kindly ask you to copy and paste your data into our templates, provided for Excel and other editors. The entries in the template and allowed value ranges are explained in the format description document. After filling in the template, do upload the file on this page. You may upload multiple files in one upload operation, so please add also any explanatory material and/or the original publication. All entries of the form below with an asterisk (*) represent mandatory fields which need to be completed. Uploaded data will be evaluated by the IHFC for final validation. Authors will be contacted during the further procedure and informed about the status.