�?�?t ρ l k + �?�?x i ρ l k v l = �?�?x j μ + μ t σ k �?k �?x j + G k �?ρ l ε �?Y M Be aware: Drillopedia.com is really a submission-based understanding-sharing website. Contributors submit details primarily based on their understanding and knowledge. Buyers must use their discretion when employing the knowledge