White band at edge of domain

[Steve Cousins <cousins@xxxxxxxxxxxxxxxxxxxxxxx>]

Hi,

I have a netCDF file that has longitudes from 23.4 degrees to 379.8
degrees stepping by 3.6 degrees.

 longitude = 23.4, 27, 30.6, 34.2, 37.8, 41.4, 45, 48.6, 52.2, 55.8, 59.4,
63, 66.6, 70.2, 73.8, 77.4, 81, 84.6, 88.2, 91.8, 95.4, 99, 102.6, 106.2,
109.8, 113.4, 117, 120.6, 124.2, 127.8, 131.4, 135, 138.6, 142.2, 145.8,
149.4, 153, 156.6, 160.2, 163.8, 167.4, 171, 174.6,178.2, 181.8, 185.4,
189, 192.6, 196.2, 199.8, 203.4, 207, 210.6, 214.2, 217.8, 221.4, 225,
228.6, 232.2, 235.8, 239.4, 243, 246.6, 250.2, 253.8, 257.4, 261, 264.6,
268.2, 271.8, 275.4, 279, 282.6, 286.2, 289.8, 293.4, 297, 300.6, 304.2,
307.8, 311.4, 315, 318.6, 322.2, 325.8, 329.4, 333, 336.6, 340.2, 343.8,
347.4, 351, 354.6, 358.2, 361.8, 365.4, 369, 372.6, 376.2, 379.8 ;
	
If I do:

	fill/k=1/l=1 SSH

It looks fine.  If I do:

	fill/i=21:120/k=1/l=1 SSH

to shift the the plot then there is a vertical white line that goes
through Africa.  You can see this at:

	http://rocky.umeoce.maine.edu/images/problem.gif

I assume this has to do with some overlap problem but I
haven't seen it before with other similar data sets.  I've checked the
data and there is data in the last column so it shouldn't be interpreted
as land.  For instance:

  379.4641, 382.4534, 358.5003, 356.5043, 353.662, 359.2267, 365.5977, 
    369.4947, 392.3723, 374.757, 372.0594, 389.124, 390.5706, 391.9053, 
    393.023, 397.463, 375.3581, 371.0126, 372.924, 392.4577, 373.5735, 
    364.2137, 364.4178, 372.6771, 392.912, 378.2903, 369.8222, 391.9157, 
    370.6215, 371.5577, 371.0256, 377.0153, 374.279, 386.7569, 390.8015, 
    371.6572, 365.4334, 366.7746, 364.0185, 362.7578, 379.4369, 377.3554, 
    375.8331, 376.2615, 376.9933, 378.4856, 379.1119, 369.9149, 373.0526, 
    376.518, 378.6648, 381.4642, 382.6173, 383.2715, 384.5013, 384.4879, 
    384.6168, 386.2058, 386.3334, 384.5129, 383.7413, 384.0238, 384.1737, 
    384.5389, 384.4421, 382.0946, 380.4161, 384.2753, 386.06, 384.2455, 
    383.0246, 381.7079, 383.1534, 385.2602, 386.4101, 370.0849, -1e+34, 
    368.7702, 362.1729, 358.6587, 360.2878, 362.5882, 363.6682, 367.4212, 
    374.6625, 380.5357, 384.4504, 386.2372, 387.3375, 386.3895, 383.0319, 
    381.321, 381.4418, 383.392, 382.2667, 382.2667, 380.2295, 376.7909, 
    379.5762, 378.9742,

This is at 66 degrees South which has valid entries for almost all of the
horizontal grid points.  -1e+34 is the land value.

Has anyone seen this before?  Any ideas about how to bridge the gap?  This
is version 5.51 on a Redhat Linux 7.3 server.

Thanks,

Steve
_____________________________________________________________
 Steve Cousins                 Email: cousins@umit.maine.edu
 Research Associate            Phone: (207) 581-4302
 Ocean Modeling Group
 School of Marine Sciences     208 Libby Hall
 University of Maine           Orono, Maine 04469