Tecnai on-line help manual -- Options - UT Southwestern

<strong>Tecnai</strong> on-line help Options 55Options Software version 23.24 File formatsThe file formats supported by photomontage are :• Small-header binary : binary data are preceded by a 10-byte header containing the data type andx,y dimensions (first three items of the the extended-header format).• Extended-header binary : the binary data are preceded by an extended header that contains thedata type, image dimensions, and several types of information stored specifically for Focus seriesreconstruction (see extended-header definition below). Note that depending on the particularsoftware that writes the file, not all values are necessarily defined.• MRC file : see separate file format description3.25 Binary file formats3.25.1 Binary data type1 - unsigned 1-byte integer2 - unsigned 2-byte integer3 - unsigned 4-byte integer4 - signed 1-byte integer5 - signed 2-byte integer6 - signed 4-byte integer7 - 4-byte (single-precision) floating point8 - 8-byte (double-precision) floating point3.25.2 Extended-header format2-byte integer : data type of the image (see above)4-byte integer : image width in pixels4-byte integer : image height in pixels4-byte integer : total size of the header in bytes (including preceding values). In effect the offset tothe data.double : Microscope type 0 = T10 and T12, 1 = T20, 2 = T30double : Gun LaB6 = 0, FEG = 1double : Lens type HC = -2, BioTWIN = -1, TWIN = 0, STWIN = 1, UTWIN = 2double : D number of microscopedouble : High tension (kV)double : Focus spreaddouble : MTFdouble : Starting defocus (nm)double : Focus step (nm)double : DAC settingdouble : Focus value (nm)double : Pixel size (nm)double : Spherical aberration (mm)double : Semi-convergence (mrad)double : Info limit (nm-1)double : Number of imagesdouble : Image number in seriesdouble : Coma xdouble : Coma ydouble : Astigmatism 2 Xdouble : Astigmatism 2 Y