prompt update

backend/main.py

@@ -40,7 +40,11 @@ GROQ_MODEL   = "llama-3.3-70b-versatile"
 GROQ_API_KEY = os.environ.get("GROQ_API_KEY", "")
 
 # ── Prompts ───────────────────────────────────────────────────────────────────
-EXTRACTION_SYSTEM = """Extract protocol parameters from this research paper. Return ONLY valid JSON:
+EXTRACTION_SYSTEM = """Extract protocol parameters from this research paper.
+IMPORTANT:
+Do not extract numbers randomly.
+Only extract values that are clearly associated with an experimental step or procedure.
+Return ONLY valid JSON:
 {
   "title": "paper title",
   "authors": "first author et al.",