/**
                 * Tranformation matrix
                 * tm = |f1 f2 0|
                 * |f3 f4 0|
                 * |f5 f6 0|
                 */
                else if (nextToken.equals(PdfOps.Tm_TOKEN)) {
// collectTokenFrequency(PdfOps.Tm_TOKEN);
                    shift = 0;
                    previousAdvance = 0;
                    advance.setLocation(0, 0);

                    //EmptyStackException if the stack is empty.
                    float f6 = ((Number) stack.pop()).floatValue(); // mab
                    float f5 = ((Number) stack.pop()).floatValue();
                    float f4 = ((Number) stack.pop()).floatValue();
                    float f3 = ((Number) stack.pop()).floatValue();
                    float f2 = ((Number) stack.pop()).floatValue();
                    float f1 = ((Number) stack.pop()).floatValue();
                    AffineTransform af = new AffineTransform(textBlockBase);