1 Introduction

The Submillimetre Common-User Bolometer Array (SCUBA) [1, 2] is a continuum instrument on the James Clerk Maxwell Telescope¹, Mauna Kea, Hawaii. SCUBA has two arrays and can observe simultaneously at two wavelengths (three wavelengths when using the photometry pixels) – the layout of the SCUBA arrays is shown in Fig. 1.

The on-line system produces data in the Starlink NDF format [3]. Both the raw demodulated data (signified by ‘_dem_’ in the file name) and a reduced image (‘RO’ file) can be stored. This package is designed to take the demodulated data (stored in the [.dem] directory on-line) and remove SCUBA dependent effects. In the case of MAP data, a rectangular-gridded image is produced, for PHOTOM observations a set of photometry data. Packages such as Gaia[4] or Kappa[5] display, for MAP, and Kappa linplot and drawsig, for PHOTOM, can be used for further processing. Calibration via planet observations can be determined using the Fluxes[6] package. The Convert[7] package can also be used to export the data into your favoured data format.

The RO file (signified by ‘_red_’ in the file name) contains the reduced data (image, skydip result, photometry result) calculated by the on-line system. These data can be examined either by using hdstrace[8] or, for images, a Starlink-compatible image display package (note that nested NDFs are used - see Appendix E).

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Figure 1: The SCUBA arrays

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