private static void processFile(String filename, double dt) {
		try {
			System.err.println("Loading file " + filename + " ...");
			JPLEphemeris ephemeris = new JPLEphemeris(filename);
			NeptuneBarycentricElements runner = new NeptuneBarycentricElements(ephemeris, dt);
			runner.run();
		} catch (JPLEphemerisException jee) {
			jee.printStackTrace();
			System.err.println("JPLEphemerisException ... " + jee);
			System.exit(1);
		} catch (IOException ioe) {
			ioe.printStackTrace();
			System.err.println("IOException ... " + ioe);
			System.exit(1);
		}
	}