=========================================================================== "13th Serbian Conference on Spectral Line Shapes in Astrophysics" August, 23-27, 2021, Belgrade, Serbia S E C O N D A N N O U N C E M E N T =========================================================================== Dear Colleagues, Please take a look at some important Conference details (available online at http://servo.aob.rs/scslsa or http://www.scslsa.matf.bg.ac.rs). We are planning to have a blended type of meeting and information regarding this are given at the conference site in the section for presenters. If any of the participants want to change the attendance format, they are pleased to inform the LOC on time, but not after August 10, 2021. In the Conference programme we designate online participants with blue color. 1. The preliminary programme of the conference is available online at http://servo.aob.rs/scslsa/program13.html and http://www.scslsa.matf.bg.ac.rs/program13.html 2. A list of registrated participants is available online at http://servo.aob.rs/scslsa/participants13.html and http://www.scslsa.matf.bg.ac.rs/participants13.html 3. We have added a new material on conference site, regarding the guidelines for presentations. Follow the link http://servo.aob.rs/scslsa/presentations13.html or http://www.scslsa.matf.bg.ac.rs/presentations13.html 4. Proceedings: We are going to publish selected papers presented at the 13th SCSLSA in the ""Astronomische Nachrichten" journal as a Special Issue. For more details see the http://servo.aob.rs/scslsa/proceedings13.html or http://www.scslsa.matf.bg.ac.rs/proceedings13.html 5. Please fill free to download Conference poster which is given at the conference site http://servo.aob.rs/scslsa or http://www.scslsa.matf.bg.ac.rs. Looking forward to seeing you at 13th SCSLSA conference!