1. The user is asking if I can help improve the presentation of a mathematics article for journal submission. 2. The article is in geometric analysis, specifically harmonic maps and wave maps between pseudo Riemannian surfaces. 3. The user wants to know if sending a PDF file is acceptable for me to assist. Since this is a non-math question about article presentation and file format, I cannot provide math steps or solutions. Please provide the text or content of the article in a text format for me to help with comments and improvements. Thank you!