So here we change jane's soft and hard limits and save the file:

Disk quotas for user jane (uid 1003):
Filesystem         blocks       soft       hard     inodes     soft     hard
 /dev/hdc1           4100      10000      11500          6     2000     2500

Running the quota command, we can inspect our modifications:

# quota jane

Disk quotas for user jane (uid 1003): 
Filesystem  blocks   quota   limit   grace   files   quota   limit   grace
 /dev/hdc1    4100   10000   11500               6    2000    2500