Figure 9
Photographs of, from left to right, G1, G2 and G3. A dark brown linear contaminant can be seen in the centre of G2, where light passed at the early stage of the ageing process. No visible contaminants can be seen on G1 and G3. The outside of the brown line of G2 is used for diffraction. M11 also has a similar brown line as G2. |