Update lib/pymedphys/_experimental/paulking/devicesfilm.py
@@ -24,7 +24,8 @@ from PIL import Image
def read_narrow_png(file_name, step_size=0.1):
- """ Extract a an relative-density profile from a narrow png file.
+ """ Extract a relative-density profile from a narrow png file.
+
Source file is a full color PNG that is sufficiently narrow that
density uniform along its short dimension. The image density along
