Next: Extending ORAC-DR for Offline Processing of ESO, INGRID, and Classic Cam data . ... The Little Template Library is an expression templates based C++ library for array processing, image processing, FITS and ASCII I/O, and linear algebra. ... Fig. 1 shows for a simple calculation, involving a constant and four two dimensional arrays in single floating point precision, that already for elements arrays one line LTL performs as good as hand optimized Code. ... construct from expression . ...