Shift in the latitude in Rsig data

There was a mysterious shift in the latitude, now corrected by the following back-projection. Thanks to Todd!

latnc = ilat(:,:,1);
WGS84AxisRatioSquared = 0.9933056199957391;
latitudeWGS84Radians = latnc.*pi/180;
latitudeSphereRadians = atan( tan( latitudeWGS84Radians )  * WGS84AxisRatioSquared );
newLat =    latitudeSphereRadians *180/pi;

The Latitude projection into this Lambert Conic map seems to have some shift of about 0.2 degree (12 km resolution).

Once the Backprojection is applied, the latitude appears to align nicely.