StarFinder v 1.1: list of modules ADD_OVERLAP Find and add the overlap region of two 2D arrays. AIRY_PATTERN Compute an Airy pattern. ALL_MAX Find relative maxima in a 2D array. ANGLE Compute the position angles of a set of points on a plane. APPEND_ELEMENTS Append new elements to a 1D vector. ARRAY_OVERLAP Find bounds of overlap region of two 2D arrays. ARRAY_PARTITION Define bounds to partition an array into a pre-fixed number of parts along one dimension. B_SPLINES Compute the 1-D observation matrix to determine the coefficients of an interpolating spline in the B-splines representation. BINARY_ARRAY Transform a 2D array to binary by thresholding. CENTER_ARRAY Shift a 2D array in order to put its maximum at a given specified position. CENTROID Compute the centroid of a 2D array. CENTROIDER Sub-pixel centering of an image by iterative fractional shift. CHECK_BORDER Check overlapping region of two 2D arrays. CIRC_MASK Apply a circular mask to a 2D array. CLICK_ON_MAX Select local maxima in an image by mouse click. COMPARE_LISTS Find coincidences between two sets of points on a plane. CONVERGENCE Check convergence condition between two variables. COORD_TO_SUBS Convert pixel coordinates in a 2D array to subscripts. CORRELATION_COEFF Compute the correlation coefficient of two 2D patterns. CORRELATE_MAX Estimate the position of a feature in an image by maximizing its correlation with a reference template. CROSSES Mark interesting points in an image with crosses. DEFAULT_DISPLAY_OPT Define default options to display a 2D image. DIAG_MULT Multiply a square array by a diagonal matrix. DISPLAY_IMAGE Display a 2D image according to a set of options. DISTANCE Compute the euclidean distance of a set of points on a plane from an origin. ESTIMATE_BACKGROUND Estimate the background emission in an image by means of IMAGE_BACKGROUND or MEDIAN_FILTER. EXTEND_ARRAY Pad 2D array with 0s. EXTEND_SHIFT Shift a 2D array without edge effects. EXTRACT_OVERLAP Extract the overlap region of two 2D arrays. FILE_NAME Return the complete name of a file in a directory whose path is among the IDL search paths. Operating system dependencies are taken into account. FIND_ROT_TRANS Find translation and rotation angle between two reference frames, given the coordinates of a set of points in the two reference frames. FITSTARS Multi-component PSF-fitting of one or more stellar images. FITTING_ERRORS Estimate formal errors on the solution of a linear algebraic system. FREQUENCY Compute a 1D vector of Fourier frequencies. FWHM Compute the FWHM of a peak in an image. GAUSS_NOISE_STD Compute standard deviation of normally distributed noise in an image. GAUSSIAN2D Compute bivariate gaussian function. GET_MAX Find coordinates of maximum intensity pixel in a 2D array. GINV Compute the Moore-Penrose generalized inverse of a rectangular matrix. HALO_SMOOTH Smooth the halo of a stellar image by means of a variable box size median filtering technique. HISTO Compute histogram. HISTO_HWHM Compute the Half Width at Half Maximum of an histogram. IMAGE_BACKGROUND Compute the background emission in a given image. IMAGE_CORE Identify the component connected to a specified starting position and above a pre-fixed threshold in a 2D array. IMAGE_MODEL Create a synthetic image given by a sum of shifted scaled replicas of a given template. IMAGE_SHIFT Apply a fractional shift to an image by interpolation. INSTR_NOISE Evaluate overall standard deviation due to normally distributed noise sources in an image. LOG2 Compute the base 2 logarithm of an integer number. LS_SYS Put a linear algebraic system into normal form. MATCH_COORD Given two sets of coordinates on a plane, representing the same points in reciprocally translated and rotated reference frames, map one of them onto the other. MAX_SEARCH Identify relative maxima in a 2D array, according to a specified set of options. MEDIAN_FILTER Extension of the IDL function MEDIAN: apply median smoothing to a 2D array, using a reduced box size at the array edge. MIN_NORM_INVERSION Compute the minimum norm solution of an algebraic system of linear equations. NEWTON_GAUSS Fit a set of data with a parametric model. PEAK_AREA Estimate the area of a peak in an image. PEAK_FWHM Compute the FWHM of a peak in an image. PEAK_WIDTH Estimate the width of a peak in an image. PHASE2D Compute the phase array for a 2D delta-function. PHOTON_NOISE Evaluate photon noise standard deviation in an image. PICK_REGION Given a partition of a planar domain, find the sub-region containing an assigned point. PLANE Compute a plane surface. PSF_EXTRACT Estimate the PSF in a stellar field image by combination of a stack of stars. RADIAL_DIST Compute a 2D array of radial distances from an origin. READ_FLOAT_DATA Read a Free Format file containing floating-point numbers, ordered by columns. RECIPROCAL_DISTANCE Compute the euclidean distance for each couple of points in a set of given points on a plane. RELATIVE_ERROR Compute the relative error between two variables. REMOVE_COINCIDENT Remove multiple occurences from a set of points on a plane. REPAIR_SATURATED Repair saturated stars in an stellar field image. REPLACE_PIX Replace known bad pixels in a 2D array by local median. RESAMPLE Resample a bivariate function defined on a rectangular domain by integrating it over square regions. ROT_TRANS Rotate and translate a set of points on a plane. SAMPLING_GRID Define a set of equally-spaced points along an axis. SCALE_LS_SYS Scale a linear system of normal equations to improve the eigenvalue ratio. SEARCH_OBJECTS Search meaningful maxima in a given image. SHIFTED_TEMPLATES Shift a template image by an integer multiple of a pre-fixed sub-pixel shift. SIMPSON_PIX_INTEGRAL Resample a bivariate function defined on a rectangular domain by integration over square regions with the Simpson rule. SIZE52 Alias of IDL 5.2 intrinsic SIZE function for previous versions. SPLINE_COEFF Compute the coefficients of the interpolating spline to a set of observations on a rectangular grid. SPLINE_INTERP Evaluate a spline function on a rectangular grid. STACK_MEDIAN Combine frames in a 3D stack by median superposition. STARFINDER Stars detection, astrometry and photometry in a stellar field. SUB_ARRAY Extract sub-array from a 2D array. SUB_ARRAYS Given a 2D array, extract a stack of sub-arrays centered at specified positions. SUBS_TO_COORD Convert vector of array subscripts to pixel coordinates. SUPERPOSE_STARS Compute stack median of a set of stars in an image. XCOMPARE_LISTS Compare two lists of objects. Widget interface. XDISPFILE Read an ASCII file and display its content on a text widget. XDISPLAYOPT Modify the display options of an image. Widget interface. XIMAGE_SUPPORT Modify the support of an image. Widget interface. XMATCH_COORD Widget interface for the MATCH_COORD procedure. XNOISE Widget application to compute the noise standard deviation for each pixel in a given image. XNOISE_STDEV Widget interface for the GAUSS_NOISE_STD procedure. XPLOT Execute simple plots. Widget interface. XPSF_EXTRACT Widget interface for the PSF_EXTRACT procedure. XPSF_SMOOTH Widget interface for the HALO_SMOOTH function. XREPLACE_PIX Widget interface for the REPLACE_PIX function. XSTARFINDER Package for stellar fields analysis. Widget interface. XSTARFINDER_RUN Widget interface for the STARFINDER procedure.