def coverage(args):
    from jcvi.formats.bed import mates, bedpe

    p = OptionParser(coverage.__doc__)
    p.add_option("--ymax", default=None, type="int",
                 help="Limit ymax [default: %default]")
    p.add_option("--spans", default=False, action="store_true",
                 help="BED files already contain clone spans [default: %default]")
    opts, args, iopts = p.set_image_options(args, figsize="8x5")

    if len(args) < 3:
        sys.exit(not p.print_help())

    fastafile, ctg = args[0:2]
    bedfiles = args[2:]

    sizes = Sizes(fastafile)
    size = sizes.mapping[ctg]

    plt.figure(1, (iopts.w, iopts.h))
    ax = plt.gca()

    bins = 100  # smooth the curve
    lines = []
    legends = []
    not_covered = []
    yy = .9
    for bedfile, c in zip(bedfiles, "rgbcky"):
        if not opts.spans:
            pf = bedfile.rsplit(".", 1)[0]
            matesfile = pf + ".mates"
            if need_update(bedfile, matesfile):
                matesfile, matesbedfile = mates([bedfile, "--lib"])

            bedspanfile = pf + ".spans.bed"
            if need_update(matesfile, bedspanfile):
                bedpefile, bedspanfile = bedpe([bedfile, "--span",
                    "--mates={0}".format(matesfile)])
            bedfile = bedspanfile

        bedsum = Bed(bedfile).sum(seqid=ctg)
        notcoveredbases = size - bedsum

        legend = bedfile.split(".")[0]
        msg = "{0}: {1} bp not covered".format(legend, thousands(notcoveredbases))
        not_covered.append(msg)
        print >> sys.stderr, msg
        ax.text(.1, yy, msg, color=c, size=9, transform=ax.transAxes)
        yy -= .08

        cov = Coverage(bedfile, sizes.filename)
        x, y = cov.get_plot_data(ctg, bins=bins)
        line, = ax.plot(x, y, '-', color=c, lw=2, alpha=.5)
        lines.append(line)
        legends.append(legend)

    leg = ax.legend(lines, legends, shadow=True, fancybox=True)
    leg.get_frame().set_alpha(.5)

    ylabel = "Average depth per {0}Kb".format(size / bins / 1000)
    ax.set_xlim(0, size)
    ax.set_ylim(0, opts.ymax)
    ax.set_xlabel(ctg)
    ax.set_ylabel(ylabel)
    set_human_base_axis(ax)

    figname ="{0}.{1}.pdf".format(fastafile, ctg)
    savefig(figname, dpi=iopts.dpi, iopts=iopts)
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