The following assume no colours terms between UKIDSS H&K and WHDF H&K:
The above is just for the original WHDF deep data, covering the central 7'x7' only. It is compared with the UKIDSS Petrosian magnitudes.
The above is just for the original WHDF deep data, covering the central 7'x7' only. It is compared with the UKIDSS K Petrosian magnitudes plus the UKIDSS aperture (H-K).
The above is for the whole area of the extended WHDF. Again we have used UKIDSS K Petrosian magnitudes plus the UKIDSS aperture (H-K) to get to UKIDSS H.