precision in axis spec from addXML

[AnsleyManke]

some URLs at nodc have xy grids of size 8640x4320, such as,

https://data.nodc.noaa.gov/thredds/dodsC/cortad/Version6/cortadv6_FilledSST.nc

They're running into an issue in LAS. The delta-x of the grid is 0.0146666... (or it should be, 1/8640, though they don't have the coords quite evenly spaced for some reason).

configuring this with addXML sets this grid in xy:

I have the dataset in my LAS,
http://dunkel.pmel.noaa.gov:8280/las/UI.vm#panelHeaderHidden=false;differences=false;autoContour=false;xCATID=id-df0400a166;xDSID=id-df0400a166;varid=FilledSSTmean-id-df0400a166;imageSize=auto;over=x;compute=Nonetoken;catid=id-df0400a166;dsid=id-df0400a166;varid=FilledSSTmean-id-df0400a166;avarcount=0;xlo=-179.9584;xhi=180.29;ylo=-89.9583;yhi=90.14;operation_id=Plot_2D_XY_zoom;view=xy

and the longitude-modulo behavior in map doesn't work and we can't request a plot on x=0:360, etc.

-179.958 + 8639* 0.0417 takes us beyond 180.0, so the rounding that's happening to get step="0.0417" is making this act as a non-modulo grid.