Now there are a few things to clean up. Primarily the big gaping hole in the middle of the planet and the seam often needs blurring.
I use two main techniques for these. Firstly the seam, I Find the best way to blend that is to use the patch tool
With the patch tool set on source select a patch that encloses the join line, drag the cursor into some clean area that looks similar. Keep repeating this; do not try to capture too much area in a single patch keep the patches small and only patch similar content. Once you have blended the join completely we can clean up the hole in the middle.
To fill in the hole in the middle I use the lasso tool. I select areas from each side of the hole and copy and paste the patches to new layers. I then slide them over the hole. Do this multiple times until the hole is more than obscure. Then the trick is to blend the edges using a layer mask
Once you have completely filled the hole with patches it probably looks a mess. At this point you can hide the individual patch layers one by one then resize and warp the patches to best align with the hole. You definitely want the patches to be bigger than the holes as the next step is to blend the edges using a layer mask and a soft brush
Hiding all the patch layers and showing only the bottom patch layer add a layer mask. Make sure the layer mask is set to white to allow the image to show through. Then select a feathered brush and painting in black start to blend away the edges.
Once you are relatively happy with your blending you can flatten all the layers then touch up with the patch tool. At this point your HDR PanoPlanet or Polar panorama is complete
If ou enjoyed this tutorial and would like more detailed instructions, or would just like to see more of these PanoPlanets, head on over to my website devoted to making these images.