A 42-year-old woman with a history of rheumatoid arthritis presents with insidious dyspnea and a dry cough for 3 months. Chest X-ray shows bilateral lower lobe interstitial infiltrates. Spirometry reveals FEV₁ = 68% predicted, FVC = 62% predicted, FEV₁/FVC ratio = 0.88. DLCO is 58% predicted. What is the most likely spirometric pattern?

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