[firedrake] Writing to file in parallel

Hello all, The website mentions a way to print data from a function that has been computed in parallel: with u.dat.vec_ro as vu: vu.view() However, I want to write this data to a file, and I'm not sure how. Moreover, is there a way I can format this so that instead of printing everything in one row, it prints it in as many rows as there are coordinates of the function? So for instance, can I write a file with three rows of data for a three dimensional function space? Thank you, Andrew Hicks