What does the length value L1+ mean

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The length value of many cylinders changes with the stroke length. Because we cannot include all the information on each cylinder stroke in our documentation, we use a little trick. For all variable length values, we state the basic length without the stroke length. In order to find out the correct length, add the stroke length to this dimension.
The variable length values are indicated in the catalogue by +
This means that, as soon as you see the plus sign behind a length value, simply add the stated dimension to the required stroke length.
For example: the length L1 specifies the basic length of the cylinder if it were to be produced with zero stroke. If this is, say, 95 mm, and the cylinder should have a stroke of 25 mm, the length would be L1 (95 + 25) 120 mm.