The mean roughness Ra matches the arithmetical mean of the absolute. values related to the profile deviation y within the reference length l. Max. profile valley depth Rmax (DIN 4768) The max. profile valley depth Rmax counts for the most significant single. roughness depths Zi within the total length lm.
Benefits. Every 500 Nectar points you redeem is Â£2.50 off your total, which means more money to spend on the goods you want. You can also save further Nectar points for each Argos purchase you make, simply by presenting your card at the checkout. Simply present your Nectar card at the till and the cashier will swipe your card to automatically deduct the points from your account (subject to system availability). 2  Any remaining balance will need to be paid in full by cash, debit or credit card on the day.
Tesco are decent; better than Nectar IMO. I think they reduced the points on fuel recently to 1 point for every Â£2 spend, but it is still not bad. Each point is worth 1p in cash vouchers, so not a great return if you spend them that way, but they are worth much more when spent elsewhere.For example, I use them to collect Airmiles.news]. Use a cashback credit card (reward 1) and then get the points from using your loyalty card (reward 2). Assuming a 1% cashback, and 1 point (or 1p) per pound spent, you get Â£1 back (one way another) every time you put in Â£50.