The ornamental design for gas analysis apparatus, as shown and described.
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1. Gas analysis apparatus
1.1 : Perspective
1.2 : Perspective
1.3 : Front
1.4 : Right
1.5 : Left
1.6 : Top
1.7 : Bottom
1.1. perspective of the analyzer (front and right side): 1.2. perspective of the analyzer (front and left side); 1.3. front of the analyzer; 1.4. left side of the analyzer; 1.5. right side of the analyzer; 1.6. top of the analyzer; 1.7. bottom of the analyzer.