(ANSA) - Bergamo, September 11 - Yara Gambariso, the 13-year-old school girl murdered in 2010, had just received her school report when she vanished and was "very happy because she got the most beautiful marks," her mother told a hushed courtroom at the trial of construction worker, Massimo Bossetti, on charges of slaying the teenager. Bossetti, seated with his lawyer rather than in the defendant's cage for the first time since the trial started, listened attentively to Maura Panarese take the stand about her daughter. Panarese was composed as she began replying to the prosecutor in the case and avoided looking at Bossetti, who was wearing a white short sleeve shirt and jeans but looked relaxed. Yara's father, Fulvio Gambirasio, gave tortured replies when he took the stand, recalling the afternoon of November 26, 2010, when Yara vanished, breaking down into tears repeatedly. "She was the glue, the salt of the family, she did everything with a somersault, a handstand," he said, "she was always happy and smiling". Defense lawyers for Bossetti expressed satisfaction that the court ordered the acquisition of the so-called "raw data" on the basis of which it was established that DNA found on Yara's body belonged to the defendant. "So far we only had an analysis of the x ray, not the x ray itself," said the lawyers, Claudio Salvagni and Paolo Camporini. "With the raw data we can establish if any mistakes were made". Yara had been "very frightened" by the case of Sarah Scazzi, a girl from Avetrana murdered the summer before Yara disappeared, her mother said in reply to questions by Bossetti's defense lawyers as to why the 13-year-old had carried out research on Internet about violence against women.