_diffrn_scan_axis.angle_range is currently defined as "The range from the starting position for the specified axis in degrees.". Read in conjunction with the chapter in volume G, this could be interpreted as the range of starting positions for the beginning of a step, or the difference between the starting position and the final position at the end of the final step. I prefer the latter interpretation, which is supported by Examples 2 and 3 for the diffrn_scan category. So, looking at line 7695 for a single-frame scan the range is given as 1.0 degree, which is the total angular range of the scan.
However, Example 1 above the previous example has 201 frames, each covering 0.1 degrees, and the scan range is given as 20.0. This suggests that range refers to the range in starting positions for each step. This cannot be reconciled by supposing that Example 1 involved no scanning of the axis during data collection as _diffrn_scan_frame_axis.angle_increment is 0.1
Can I suggest either correcting Example 1 or Examples 2 and 3, and improving the definition text to clarify which interpretation is correct?
_diffrn_scan_axis.angle_rangeis currently defined as "The range from the starting position for the specified axis in degrees.". Read in conjunction with the chapter in volume G, this could be interpreted as the range of starting positions for the beginning of a step, or the difference between the starting position and the final position at the end of the final step. I prefer the latter interpretation, which is supported by Examples 2 and 3 for the diffrn_scan category. So, looking at line 7695 for a single-frame scan the range is given as 1.0 degree, which is the total angular range of the scan.However, Example 1 above the previous example has 201 frames, each covering 0.1 degrees, and the scan range is given as 20.0. This suggests that range refers to the range in starting positions for each step. This cannot be reconciled by supposing that Example 1 involved no scanning of the axis during data collection as
_diffrn_scan_frame_axis.angle_incrementis 0.1Can I suggest either correcting Example 1 or Examples 2 and 3, and improving the definition text to clarify which interpretation is correct?